Some explosions code cleanup (#57493)

Clears out two deprecated explosions systems (explosion ids and explosion levels)
Refactors a bunch of contents_explosions procs to be maybe slightly faster.
Cleans up a bunch of ex_act code.
Slightly cleaner code
A few less unused vars on /atom and /turf

code/controllers/subsystem/explosions.dm

@@ -470,7 +470,6 @@ SUBSYSTEM_DEF(explosions)
 		lowturf = list()
 		for(var/thing in low_turf)
 			var/turf/turf_thing = thing
-			turf_thing.explosion_level = max(turf_thing.explosion_level, EXPLODE_LIGHT)
 			turf_thing.ex_act(EXPLODE_LIGHT)
 		cost_lowturf = MC_AVERAGE(cost_lowturf, TICK_DELTA_TO_MS(TICK_USAGE_REAL - timer))
 
@@ -479,7 +478,6 @@ SUBSYSTEM_DEF(explosions)
 		medturf = list()
 		for(var/thing in med_turf)
 			var/turf/turf_thing = thing
-			turf_thing.explosion_level = max(turf_thing.explosion_level, EXPLODE_HEAVY)
 			turf_thing.ex_act(EXPLODE_HEAVY)
 		cost_medturf = MC_AVERAGE(cost_medturf, TICK_DELTA_TO_MS(TICK_USAGE_REAL - timer))
 
@@ -488,7 +486,6 @@ SUBSYSTEM_DEF(explosions)
 		highturf = list()
 		for(var/thing in high_turf)
 			var/turf/turf_thing = thing
-			turf_thing.explosion_level = max(turf_thing.explosion_level, EXPLODE_DEVASTATE)
 			turf_thing.ex_act(EXPLODE_DEVASTATE)
 		cost_highturf = MC_AVERAGE(cost_highturf, TICK_DELTA_TO_MS(TICK_USAGE_REAL - timer))
 

code/game/atoms_movable.dm

@@ -36,7 +36,6 @@
 	var/atom/movable/moving_from_pull //attempt to resume grab after moving instead of before.
 	var/list/client_mobs_in_contents // This contains all the client mobs within this container
 	var/list/area_sensitive_contents // A (nested) list of contents that need to be sent signals to when moving between areas. Can include src.
-	var/list/acted_explosions //for explosion dodging
 	var/datum/forced_movement/force_moving = null //handled soley by forced_movement.dm
 
 	/**
@@ -939,14 +938,6 @@
 	. += "<option value='?_src_=holder;[HrefToken()];adminplayerobservefollow=[REF(src)]'>Follow</option>"
 	. += "<option value='?_src_=holder;[HrefToken()];admingetmovable=[REF(src)]'>Get</option>"
 
-/atom/movable/proc/ex_check(ex_id)
-	if(!ex_id)
-		return TRUE
-	LAZYINITLIST(acted_explosions)
-	if(ex_id in acted_explosions)
-		return FALSE
-	acted_explosions += ex_id
-	return TRUE
 
 /* Language procs
 * Unless you are doing something very specific, these are the ones you want to use.

code/game/machinery/PDApainter.dm

@@ -78,10 +78,22 @@
 		stored_id_card = null
 
 /obj/machinery/pdapainter/contents_explosion(severity, target)
-	if(stored_pda)
-		stored_pda.ex_act(severity, target)
-	if(stored_id_card)
-		stored_id_card.ex_act(severity, target)
+	switch(severity)
+		if(EXPLODE_DEVASTATE)
+			if(stored_pda)
+				SSexplosions.high_mov_atom += stored_pda
+			if(stored_id_card)
+				SSexplosions.high_mov_atom += stored_id_card
+		if(EXPLODE_HEAVY)
+			if(stored_pda)
+				SSexplosions.med_mov_atom += stored_pda
+			if(stored_id_card)
+				SSexplosions.med_mov_atom += stored_id_card
+		if(EXPLODE_LIGHT)
+			if(stored_pda)
+				SSexplosions.low_mov_atom += stored_pda
+			if(stored_id_card)
+				SSexplosions.low_mov_atom += stored_id_card
 
 /obj/machinery/pdapainter/handle_atom_del(atom/A)
 	if(A == stored_pda)

code/game/machinery/_machinery.dm

@@ -548,7 +548,16 @@
 		return TRUE
 
 /obj/machinery/contents_explosion(severity, target)
-	occupant?.ex_act(severity, target)
+	if(!occupant)
+		return
+
+	switch(severity)
+		if(EXPLODE_DEVASTATE)
+			SSexplosions.high_mov_atom += occupant
+		if(EXPLODE_HEAVY)
+			SSexplosions.med_mov_atom += occupant
+		if(EXPLODE_LIGHT)
+			SSexplosions.low_mov_atom += occupant
 
 /obj/machinery/handle_atom_del(atom/A)
 	if(A == occupant)

code/game/machinery/aug_manipulator.dm

@@ -42,8 +42,16 @@
 		storedpart = null
 
 /obj/machinery/aug_manipulator/contents_explosion(severity, target)
-	if(storedpart)
-		storedpart.ex_act(severity, target)
+	if(!storedpart)
+		return
+
+	switch(severity)
+		if(EXPLODE_DEVASTATE)
+			SSexplosions.high_mov_atom += storedpart
+		if(EXPLODE_HEAVY)
+			SSexplosions.med_mov_atom += storedpart
+		if(EXPLODE_LIGHT)
+			SSexplosions.low_mov_atom += storedpart
 
 /obj/machinery/aug_manipulator/handle_atom_del(atom/A)
 	if(A == storedpart)

code/game/machinery/camera/camera.dm

@@ -173,8 +173,8 @@
 
 /obj/machinery/camera/ex_act(severity, target)
 	if(invuln)
-		return
-	..()
+		return FALSE
+	return ..()
 
 /obj/machinery/camera/proc/setViewRange(num = 7)
 	src.view_range = num

code/game/machinery/doors/door.dm

@@ -432,7 +432,7 @@
 
 /obj/machinery/door/ex_act(severity, target)
 	//if it blows up a wall it should blow up a door
-	..(severity ? max(1, severity - 1) : 0, target)
+	return ..(severity ? max(1, severity - 1) : 0, target)
 
 /obj/machinery/door/GetExplosionBlock()
 	return density ? real_explosion_block : 0

code/game/machinery/doors/passworddoor.dm

@@ -68,4 +68,4 @@
 	return
 
 /obj/machinery/door/password/ex_act(severity, target)
-	return
+	return FALSE

code/game/machinery/doors/poddoor.dm

@@ -141,9 +141,9 @@
 
 //"BLAST" doors are obviously stronger than regular doors when it comes to BLASTS.
 /obj/machinery/door/poddoor/ex_act(severity, target)
-	if(severity == 3)
-		return
-	..()
+	if(severity == EXPLODE_LIGHT)
+		return FALSE
+	return ..()
 
 /obj/machinery/door/poddoor/do_animate(animation)
 	switch(animation)

code/game/objects/effects/anomalies.dm

@@ -75,7 +75,7 @@
 	return
 
 /obj/effect/anomaly/ex_act(severity, target)
-	if(severity == 1)
+	if(severity == EXPLODE_DEVASTATE)
 		qdel(src)
 
 /obj/effect/anomaly/proc/anomalyNeutralize()

code/game/objects/effects/decals/cleanable.dm

@@ -73,7 +73,7 @@
 	if(reagents)
 		for(var/datum/reagent/R in reagents.reagent_list)
 			R.on_ex_act()
-	..()
+	return ..()
 
 /obj/effect/decal/cleanable/fire_act(exposed_temperature, exposed_volume)
 	if(reagents)

code/game/objects/effects/decals/cleanable/aliens.dm

@@ -54,7 +54,7 @@
 	streak(dirs)
 
 /obj/effect/decal/cleanable/xenoblood/xgibs/ex_act()
-	return
+	return FALSE
 
 /obj/effect/decal/cleanable/xenoblood/xgibs/up
 	icon_state = "xgibup1"

code/game/objects/effects/decals/cleanable/humans.dm

@@ -109,7 +109,7 @@
 	AddComponent(/datum/component/rot/gibs)
 
 /obj/effect/decal/cleanable/blood/gibs/ex_act(severity, target)
-	return
+	return FALSE
 
 /obj/effect/decal/cleanable/blood/gibs/Crossed(atom/movable/L)
 	if(isliving(L) && has_gravity(loc))

code/game/objects/effects/decals/cleanable/misc.dm

@@ -89,7 +89,7 @@
 	beauty = -300
 
 /obj/effect/decal/cleanable/greenglow/ex_act()
-	return
+	return FALSE
 
 /obj/effect/decal/cleanable/greenglow/filled/Initialize()
 	. = ..()
@@ -181,7 +181,7 @@
 	mergeable_decal = FALSE
 
 /obj/effect/decal/cleanable/shreds/ex_act(severity, target)
-	if(severity == 1) //so shreds created during an explosion aren't deleted by the explosion.
+	if(severity == EXPLODE_DEVASTATE) //so shreds created during an explosion aren't deleted by the explosion.
 		qdel(src)
 
 /obj/effect/decal/cleanable/shreds/Initialize(mapload, oldname)

code/game/objects/effects/decals/cleanable/robots.dm

@@ -45,7 +45,7 @@
 	streak(dirs)
 
 /obj/effect/decal/cleanable/robot_debris/ex_act()
-	return
+	return FALSE
 
 /obj/effect/decal/cleanable/robot_debris/limb
 	icon_state = "gibarm"

code/game/objects/effects/effects.dm

@@ -27,7 +27,7 @@
 	return
 
 /obj/effect/ex_act(severity, target)
-	return
+	return FALSE
 
 /obj/effect/singularity_act()
 	qdel(src)

code/game/objects/effects/phased_mob.dm

@@ -32,7 +32,7 @@
 	return ..()
 
 /obj/effect/dummy/phased_mob/ex_act()
-	return
+	return FALSE
 
 /obj/effect/dummy/phased_mob/bullet_act(blah)
 	return BULLET_ACT_FORCE_PIERCE

code/game/objects/items/chrono_eraser.dm

@@ -271,7 +271,7 @@
 	return
 
 /obj/structure/chrono_field/ex_act()
-	return
+	return FALSE
 
 /obj/structure/chrono_field/blob_act(obj/structure/blob/B)
 	return

code/game/objects/items/devices/portable_chem_mixer.dm

@@ -36,8 +36,8 @@
 	return ..()
 
 /obj/item/storage/portable_chem_mixer/ex_act(severity, target)
-	if(severity < 3)
-		..()
+	if(severity < EXPLODE_LIGHT)
+		return ..()
 
 /obj/item/storage/portable_chem_mixer/attackby(obj/item/I, mob/user, params)
 	var/locked = SEND_SIGNAL(src, COMSIG_IS_STORAGE_LOCKED)

code/game/objects/items/latexballoon.dm

@@ -44,9 +44,9 @@
 /obj/item/latexballon/ex_act(severity, target)
 	burst()
 	switch(severity)
-		if (1)
+		if (EXPLODE_DEVASTATE)
 			qdel(src)
-		if (2)
+		if (EXPLODE_HEAVY)
 			if (prob(50))
 				qdel(src)
 

code/game/objects/items/melee/misc.dm

@@ -487,8 +487,10 @@
 	balanced = 0
 
 /obj/item/melee/supermatter_sword/ex_act(severity, target)
-	visible_message("<span class='danger'>The blast wave smacks into [src] and rapidly flashes to ash.</span>",\
-	"<span class='hear'>You hear a loud crack as you are washed with a wave of heat.</span>")
+	visible_message(
+		"<span class='danger'>The blast wave smacks into [src] and rapidly flashes to ash.</span>",
+		"<span class='hear'>You hear a loud crack as you are washed with a wave of heat.</span>"
+	)
 	consume_everything()
 
 /obj/item/melee/supermatter_sword/acid_act()

code/game/objects/items/puzzle_pieces.dm

@@ -55,7 +55,7 @@
 	return
 
 /obj/machinery/door/keycard/ex_act(severity, target)
-	return
+	return FALSE
 
 /obj/machinery/door/keycard/try_to_activate_door(mob/user)
 	add_fingerprint(user)

code/game/objects/items/storage/storage.dm

@@ -19,14 +19,13 @@
 	return FALSE
 
 /obj/item/storage/contents_explosion(severity, target)
-	for(var/thing in contents)
-		switch(severity)
-			if(EXPLODE_DEVASTATE)
-				SSexplosions.high_mov_atom += thing
-			if(EXPLODE_HEAVY)
-				SSexplosions.med_mov_atom += thing
-			if(EXPLODE_LIGHT)
-				SSexplosions.low_mov_atom += thing
+	switch(severity)
+		if(EXPLODE_DEVASTATE)
+			SSexplosions.high_mov_atom += contents
+		if(EXPLODE_HEAVY)
+			SSexplosions.med_mov_atom += contents
+		if(EXPLODE_LIGHT)
+			SSexplosions.low_mov_atom += contents
 
 /obj/item/storage/canStrip(mob/who)
 	. = ..()

code/game/objects/obj_defense.dm

@@ -57,18 +57,19 @@
 /obj/ex_act(severity, target)
 	if(resistance_flags & INDESTRUCTIBLE)
 		return
-	..() //contents explosion
+
+	. = ..() //contents explosion
 	if(QDELETED(src))
 		return
 	if(target == src)
 		take_damage(INFINITY, BRUTE, BOMB, 0)
 		return
 	switch(severity)
-		if(1)
+		if(EXPLODE_DEVASTATE)
 			take_damage(INFINITY, BRUTE, BOMB, 0)
-		if(2)
+		if(EXPLODE_HEAVY)
 			take_damage(rand(100, 250), BRUTE, BOMB, 0)
-		if(3)
+		if(EXPLODE_LIGHT)
 			take_damage(rand(10, 90), BRUTE, BOMB, 0)
 
 /obj/bullet_act(obj/projectile/P)

code/game/objects/structures/crates_lockers/closets.dm

@@ -502,14 +502,13 @@
 				req_access += pick(SSid_access.get_region_access_list(list(REGION_ALL_STATION)))
 
 /obj/structure/closet/contents_explosion(severity, target)
-	for(var/thing in contents)
-		switch(severity)
-			if(EXPLODE_DEVASTATE)
-				SSexplosions.high_mov_atom += thing
-			if(EXPLODE_HEAVY)
-				SSexplosions.med_mov_atom += thing
-			if(EXPLODE_LIGHT)
-				SSexplosions.low_mov_atom += thing
+	switch(severity)
+		if(EXPLODE_DEVASTATE)
+			SSexplosions.high_mov_atom += contents
+		if(EXPLODE_HEAVY)
+			SSexplosions.med_mov_atom += contents
+		if(EXPLODE_LIGHT)
+			SSexplosions.low_mov_atom += contents
 
 /obj/structure/closet/singularity_act()
 	dump_contents()

code/game/objects/structures/crates_lockers/closets/secure/freezer.dm

@@ -21,10 +21,9 @@
 		recursive_organ_check(src)
 
 /obj/structure/closet/secure_closet/freezer/ex_act()
-	if(!jones)
-		jones = TRUE
-	else
-		..()
+	if(jones)
+		return ..()
+	jones = TRUE
 
 /obj/structure/closet/secure_closet/freezer/kitchen
 	name = "kitchen cabinet"

code/game/objects/structures/extinguisher.dm

@@ -32,14 +32,16 @@
 	return ..()
 
 /obj/structure/extinguisher_cabinet/contents_explosion(severity, target)
-	if(stored_extinguisher)
-		switch(severity)
-			if(EXPLODE_DEVASTATE)
-				SSexplosions.high_mov_atom += stored_extinguisher
-			if(EXPLODE_HEAVY)
-				SSexplosions.med_mov_atom += stored_extinguisher
-			if(EXPLODE_LIGHT)
-				SSexplosions.low_mov_atom += stored_extinguisher
+	if(!stored_extinguisher)
+		return
+
+	switch(severity)
+		if(EXPLODE_DEVASTATE)
+			SSexplosions.high_mov_atom += stored_extinguisher
+		if(EXPLODE_HEAVY)
+			SSexplosions.med_mov_atom += stored_extinguisher
+		if(EXPLODE_LIGHT)
+			SSexplosions.low_mov_atom += stored_extinguisher
 
 /obj/structure/extinguisher_cabinet/handle_atom_del(atom/A)
 	if(A == stored_extinguisher)

code/game/objects/structures/guncase.dm

@@ -113,14 +113,13 @@
 	update_appearance()
 
 /obj/structure/guncase/contents_explosion(severity, target)
-	for(var/thing in contents)
-		switch(severity)
-			if(EXPLODE_DEVASTATE)
-				SSexplosions.high_mov_atom += thing
-			if(EXPLODE_HEAVY)
-				SSexplosions.med_mov_atom += thing
-			if(EXPLODE_LIGHT)
-				SSexplosions.low_mov_atom += thing
+	switch(severity)
+		if(EXPLODE_DEVASTATE)
+			SSexplosions.high_mov_atom += contents
+		if(EXPLODE_HEAVY)
+			SSexplosions.med_mov_atom += contents
+		if(EXPLODE_LIGHT)
+			SSexplosions.low_mov_atom += contents
 
 /obj/structure/guncase/shotgun
 	name = "shotgun locker"

code/game/objects/structures/reflector.dm

@@ -246,9 +246,8 @@
 
 /obj/structure/reflector/ex_act()
 	if(admin)
-		return
-	else
-		return ..()
+		return FALSE
+	return ..()
 
 /obj/structure/reflector/singularity_act()
 	if(admin)

code/game/objects/structures/safe.dm

@@ -83,7 +83,7 @@ FLOOR SAFES
 	return
 
 /obj/structure/safe/ex_act(severity, target)
-	if(((severity == 2 && target == src) || severity == 1) && explosion_count < BROKEN_THRESHOLD)
+	if(((severity == EXPLODE_HEAVY && target == src) || severity == EXPLODE_DEVASTATE) && explosion_count < BROKEN_THRESHOLD)
 		explosion_count++
 		switch(explosion_count)
 			if(1)

code/game/objects/structures/tank_holder.dm

@@ -80,8 +80,16 @@
 	return ..()
 
 /obj/structure/tank_holder/contents_explosion(severity, target)
-	if(tank)
-		tank.ex_act(severity, target)
+	if(!tank)
+		return
+
+	switch(severity)
+		if(EXPLODE_DEVASTATE)
+			SSexplosions.high_mov_atom += tank
+		if(EXPLODE_HEAVY)
+			SSexplosions.med_mov_atom += tank
+		if(EXPLODE_LIGHT)
+			SSexplosions.low_mov_atom += tank
 
 /// Call this after taking the tank from contents in order to update references, icon
 /// and density.

code/game/objects/structures/transit_tubes/transit_tube_pod.dm

@@ -60,19 +60,18 @@
 	qdel(src)
 
 /obj/structure/transit_tube_pod/ex_act(severity, target)
-	..()
+	. = ..()
 	if(!QDELETED(src))
 		empty_pod()
 
 /obj/structure/transit_tube_pod/contents_explosion(severity, target)
-	for(var/thing in contents)
-		switch(severity)
-			if(EXPLODE_DEVASTATE)
-				SSexplosions.high_mov_atom += thing
-			if(EXPLODE_HEAVY)
-				SSexplosions.med_mov_atom += thing
-			if(EXPLODE_LIGHT)
-				SSexplosions.low_mov_atom += thing
+	switch(severity)
+		if(EXPLODE_DEVASTATE)
+			SSexplosions.high_mov_atom += contents
+		if(EXPLODE_HEAVY)
+			SSexplosions.med_mov_atom += contents
+		if(EXPLODE_LIGHT)
+			SSexplosions.low_mov_atom += contents
 
 /obj/structure/transit_tube_pod/singularity_pull(S, current_size)
 	..()

code/game/turfs/change_turf.dm

@@ -82,8 +82,6 @@ GLOBAL_LIST_INIT(blacklisted_automated_baseturfs, typecacheof(list(
 	var/old_corners = corners
 	var/old_directional_opacity = directional_opacity
 
-	var/old_exl = explosion_level
-	var/old_exi = explosion_id
 	var/old_bp = blueprint_data
 	blueprint_data = null
 
@@ -108,9 +106,6 @@ GLOBAL_LIST_INIT(blacklisted_automated_baseturfs, typecacheof(list(
 	else
 		W.baseturfs = baseturfs_string_list(old_baseturfs, W) //Just to be safe
 
-	W.explosion_id = old_exi
-	W.explosion_level = old_exl
-
 	if(!(flags & CHANGETURF_DEFER_CHANGE))
 		W.AfterChange(flags, old_type)
 

code/game/turfs/closed/minerals.dm

@@ -162,16 +162,16 @@
 	ScrapeAway()
 
 /turf/closed/mineral/ex_act(severity, target)
-	..()
+	. = ..()
 	switch(severity)
-		if(3)
-			if (prob(75))
-				gets_drilled(null, FALSE)
-		if(2)
-			if (prob(90))
-				gets_drilled(null, FALSE)
-		if(1)
+		if(EXPLODE_DEVASTATE)
 			gets_drilled(null, FALSE)
+		if(EXPLODE_HEAVY)
+			if(prob(90))
+				gets_drilled(null, FALSE)
+		if(EXPLODE_LIGHT)
+			if(prob(75))
+				gets_drilled(null, FALSE)
 	return
 
 /turf/closed/mineral/random
@@ -674,6 +674,6 @@
 	return
 
 /turf/closed/mineral/strong/ex_act(severity, target)
-	return
+	return FALSE
 
 #undef MINING_MESSAGE_COOLDOWN

code/game/turfs/closed/wall/mineral_walls.dm

@@ -349,7 +349,7 @@
 /turf/closed/wall/mineral/plastitanium/explosive/ex_act(severity)
 	var/obj/item/bombcore/large/bombcore = new(get_turf(src))
 	bombcore.detonate()
-	..()
+	return ..()
 
 /turf/closed/wall/mineral/plastitanium/hulk_recoil(obj/item/bodypart/arm, mob/living/carbon/human/hulkman, damage = 41)
 	return ..()

code/game/turfs/closed/walls.dm

@@ -62,7 +62,7 @@
 /turf/closed/wall/attack_tk()
 	return
 
-/turf/closed/wall/proc/dismantle_wall(devastated=0, explode=0)
+/turf/closed/wall/proc/dismantle_wall(devastated = FALSE, explode = FALSE)
 	if(devastated)
 		devastate_wall()
 	else
@@ -92,18 +92,16 @@
 	if(target == src)
 		dismantle_wall(1,1)
 		return
+
 	switch(severity)
-		if(1)
+		if(EXPLODE_DEVASTATE)
 			//SN src = null
 			var/turf/NT = ScrapeAway()
 			NT.contents_explosion(severity, target)
 			return
-		if(2)
-			if (prob(50))
-				dismantle_wall(0,1)
-			else
-				dismantle_wall(1,1)
-		if(3)
+		if(EXPLODE_HEAVY)
+			dismantle_wall(prob(50), TRUE)
+		if(EXPLODE_LIGHT)
 			if (prob(hardness))
 				dismantle_wall(0,1)
 	if(!density)

code/game/turfs/open/floor.dm

@@ -61,21 +61,22 @@
 	return ..()
 
 /turf/open/floor/ex_act(severity, target)
-	var/shielded = is_shielded()
-	..()
-	if(severity != 1 && shielded && target != src)
-		return
+	. = ..()
+
 	if(target == src)
 		ScrapeAway(flags = CHANGETURF_INHERIT_AIR)
-		return
-	if(target != null)
-		severity = 3
+		return TRUE
+	if(severity != EXPLODE_DEVASTATE && is_shielded())
+		return FALSE
+
+	if(target)
+		severity = EXPLODE_LIGHT
 
 	switch(severity)
-		if(1)
+		if(EXPLODE_DEVASTATE)
 			ScrapeAway(2, flags = CHANGETURF_INHERIT_AIR)
-		if(2)
-			switch(rand(1,3))
+		if(EXPLODE_HEAVY)
+			switch(rand(1, 3))
 				if(1)
 					if(!length(baseturfs) || !ispath(baseturfs[baseturfs.len-1], /turf/open/floor))
 						ScrapeAway(flags = CHANGETURF_INHERIT_AIR)
@@ -94,7 +95,7 @@
 					hotspot_expose(1000,CELL_VOLUME)
 					if(prob(33))
 						new /obj/item/stack/sheet/iron(src)
-		if(3)
+		if(EXPLODE_LIGHT)
 			if (prob(50))
 				src.break_tile()
 				src.hotspot_expose(1000,CELL_VOLUME)

code/game/turfs/open/floor/plating.dm

@@ -144,7 +144,7 @@
 	return FALSE
 
 /turf/open/floor/plating/foam/ex_act()
-	..()
+	. = ..()
 	ScrapeAway(flags = CHANGETURF_INHERIT_AIR)
 
 /turf/open/floor/plating/foam/tool_act(mob/living/user, obj/item/I, tool_type)

code/game/turfs/open/floor/reinf_floor.dm

@@ -53,16 +53,16 @@
 	acidpwr = min(acidpwr, 50) //we reduce the power so reinf floor never get melted.
 	return ..()
 
-/turf/open/floor/engine/ex_act(severity,target)
-	var/shielded = is_shielded()
+/turf/open/floor/engine/ex_act(severity, target)
 	contents_explosion(severity, target)
-	if(severity != 1 && shielded && target != src)
-		return
 	if(target == src)
 		ScrapeAway(flags = CHANGETURF_INHERIT_AIR)
-		return
+		return TRUE
+	if(severity != EXPLODE_DEVASTATE && is_shielded())
+		return FALSE
+
 	switch(severity)
-		if(1)
+		if(EXPLODE_DEVASTATE)
 			if(prob(80))
 				if(!length(baseturfs) || !ispath(baseturfs[baseturfs.len-1], /turf/open/floor))
 					ScrapeAway(flags = CHANGETURF_INHERIT_AIR)
@@ -73,7 +73,7 @@
 				ScrapeAway(2, flags = CHANGETURF_INHERIT_AIR)
 			else
 				ScrapeAway(flags = CHANGETURF_INHERIT_AIR)
-		if(2)
+		if(EXPLODE_HEAVY)
 			if(prob(50))
 				ScrapeAway(flags = CHANGETURF_INHERIT_AIR)
 

code/game/turfs/turf.dm

@@ -24,8 +24,6 @@ GLOBAL_LIST_EMPTY(station_turfs)
 
 	var/list/image/blueprint_data //for the station blueprints, images of objects eg: pipes
 
-	var/explosion_level = 0 //for preventing explosion dodging
-	var/explosion_id = 0
 	var/list/explosion_throw_details
 
 	var/requires_activation //add to air processing after initialize?
@@ -480,8 +478,6 @@ GLOBAL_LIST_EMPTY(station_turfs)
 		var/atom/movable/movable_thing = thing
 		if(QDELETED(movable_thing))
 			continue
-		if(!movable_thing.ex_check(explosion_id))
-			continue
 		switch(severity)
 			if(EXPLODE_DEVASTATE)
 				SSexplosions.high_mov_atom += movable_thing

code/modules/antagonists/revenant/revenant.dm

@@ -174,7 +174,7 @@
 //Immunities
 
 /mob/living/simple_animal/revenant/ex_act(severity, target)
-	return 1 //Immune to the effects of explosions.
+	return FALSE //Immune to the effects of explosions.
 
 /mob/living/simple_animal/revenant/blob_act(obj/structure/blob/B)
 	return //blah blah blobs aren't in tune with the spirit world, or something.

code/modules/antagonists/slaughter/slaughter.dm

@@ -249,11 +249,11 @@
 
 /mob/living/simple_animal/hostile/imp/slaughter/laughter/ex_act(severity)
 	switch(severity)
-		if(1)
+		if(EXPLODE_DEVASTATE)
 			death()
-		if(2)
+		if(EXPLODE_HEAVY)
 			adjustBruteLoss(60)
-		if(3)
+		if(EXPLODE_LIGHT)
 			adjustBruteLoss(30)
 
 /mob/living/simple_animal/hostile/imp/slaughter/laughter/proc/release_friends()

code/modules/atmospherics/machinery/components/unary_devices/cryo.dm

@@ -163,15 +163,17 @@
 	return ..()
 
 /obj/machinery/atmospherics/components/unary/cryo_cell/contents_explosion(severity, target)
-	..()
-	if(beaker)
-		switch(severity)
-			if(EXPLODE_DEVASTATE)
-				SSexplosions.high_mov_atom += beaker
-			if(EXPLODE_HEAVY)
-				SSexplosions.med_mov_atom += beaker
-			if(EXPLODE_LIGHT)
-				SSexplosions.low_mov_atom += beaker
+	. = ..()
+	if(!beaker)
+		return
+
+	switch(severity)
+		if(EXPLODE_DEVASTATE)
+			SSexplosions.high_mov_atom += beaker
+		if(EXPLODE_HEAVY)
+			SSexplosions.med_mov_atom += beaker
+		if(EXPLODE_LIGHT)
+			SSexplosions.low_mov_atom += beaker
 
 /obj/machinery/atmospherics/components/unary/cryo_cell/handle_atom_del(atom/A)
 	..()

code/modules/atmospherics/machinery/portable/portable_atmospherics.dm

@@ -33,8 +33,9 @@
 
 /obj/machinery/portable_atmospherics/ex_act(severity, target)
 	if(resistance_flags & INDESTRUCTIBLE)
-		return //Indestructable cans shouldn't release air
-	if(severity == 1 || target == src)
+		return FALSE //Indestructable cans shouldn't release air
+
+	if(severity == EXPLODE_DEVASTATE || target == src)
 		//This explosion will destroy the can, release its air.
 		var/turf/T = get_turf(src)
 		T.assume_air(air_contents)

code/modules/cargo/supplypod.dm

@@ -188,7 +188,7 @@
 		..()
 
 /obj/structure/closet/supplypod/ex_act() //Explosions dont do SHIT TO US! This is because supplypods create explosions when they land.
-	return
+	return FALSE
 
 /obj/structure/closet/supplypod/contents_explosion() //Supplypods also protect their contents from the harmful effects of fucking exploding.
 	return

code/modules/hydroponics/biogenerator.dm

@@ -27,15 +27,17 @@
 	return ..()
 
 /obj/machinery/biogenerator/contents_explosion(severity, target)
-	..()
-	if(beaker)
-		switch(severity)
-			if(EXPLODE_DEVASTATE)
-				SSexplosions.high_mov_atom += beaker
-			if(EXPLODE_HEAVY)
-				SSexplosions.med_mov_atom += beaker
-			if(EXPLODE_LIGHT)
-				SSexplosions.low_mov_atom += beaker
+	. = ..()
+	if(!beaker)
+		return
+
+	switch(severity)
+		if(EXPLODE_DEVASTATE)
+			SSexplosions.high_mov_atom += beaker
+		if(EXPLODE_HEAVY)
+			SSexplosions.med_mov_atom += beaker
+		if(EXPLODE_LIGHT)
+			SSexplosions.low_mov_atom += beaker
 
 /obj/machinery/biogenerator/handle_atom_del(atom/A)
 	..()

code/modules/lighting/lighting_object.dm

@@ -131,7 +131,7 @@
 // Variety of overrides so the overlays don't get affected by weird things.
 
 /atom/movable/lighting_object/ex_act(severity)
-	return
+	return FALSE
 
 /atom/movable/lighting_object/singularity_act()
 	return

code/modules/mining/machine_redemption.dm

@@ -347,7 +347,7 @@
 
 /obj/machinery/mineral/ore_redemption/ex_act(severity, target)
 	do_sparks(5, TRUE, src)
-	..()
+	return ..()
 
 /obj/machinery/mineral/ore_redemption/update_icon_state()
 	icon_state = "[initial(icon_state)][powered() ? null : "-off"]"

code/modules/mining/machine_vending.dm

@@ -200,7 +200,7 @@
 
 /obj/machinery/mineral/equipment_vendor/ex_act(severity, target)
 	do_sparks(5, TRUE, src)
-	if(prob(50 / severity) && severity < 3)
+	if(prob(50 / severity) && severity < EXPLODE_LIGHT)
 		qdel(src)
 
 /****************Golem Point Vendor**************************/

code/modules/mining/ores_coins.dm

@@ -131,9 +131,8 @@ GLOBAL_LIST_INIT(sand_recipes, list(\
 	qdel(src)
 
 /obj/item/stack/ore/glass/ex_act(severity, target)
-	if (severity == EXPLODE_NONE)
-		return
-	qdel(src)
+	if(severity != EXPLODE_NONE)
+		qdel(src)
 
 /obj/item/stack/ore/glass/basalt
 	name = "volcanic ash"
@@ -335,9 +334,8 @@ GLOBAL_LIST_INIT(sand_recipes, list(\
 	pixel_y = base_pixel_y + rand(0, 8) - 8
 
 /obj/item/stack/ore/ex_act(severity, target)
-	if (!severity || severity >= 2)
-		return
-	qdel(src)
+	if(severity == EXPLODE_DEVASTATE)
+		qdel(src)
 
 
 /*****************************Coin********************************/

code/modules/mob/living/brain/brain.dm

@@ -38,7 +38,7 @@
 
 
 /mob/living/brain/ex_act() //you cant blow up brainmobs because it makes transfer_to() freak out when borgs blow up.
-	return
+	return FALSE
 
 /mob/living/brain/blob_act(obj/structure/blob/B)
 	return

code/modules/mob/living/carbon/alien/alien_defense.dm

@@ -102,10 +102,12 @@ In all, this is a lot like the monkey code. /N
 
 /mob/living/carbon/alien/ex_act(severity, target, origin)
 	if(origin && istype(origin, /datum/spacevine_mutation) && isvineimmune(src))
-		return
-	..()
+		return FALSE
+
+	. = ..()
 	if(QDELETED(src))
 		return
+
 	var/obj/item/organ/ears/ears = getorganslot(ORGAN_SLOT_EARS)
 	switch (severity)
 		if (EXPLODE_DEVASTATE)

code/modules/mob/living/carbon/human/human_defense.dm

@@ -378,8 +378,9 @@
 
 /mob/living/carbon/human/ex_act(severity, target, origin)
 	if(TRAIT_BOMBIMMUNE in dna.species.species_traits)
-		return
-	..()
+		return FALSE
+
+	. = ..()
 	if (!severity || QDELETED(src))
 		return
 	var/brute_loss = 0
@@ -433,7 +434,7 @@
 	take_overall_damage(brute_loss,burn_loss)
 
 	//attempt to dismember bodyparts
-	if(severity <= 2 || !bomb_armor)
+	if(severity <= EXPLODE_HEAVY || !bomb_armor)
 		var/max_limb_loss = round(4/severity) //so you don't lose four limbs at severity 3.
 		for(var/X in bodyparts)
 			var/obj/item/bodypart/BP = X

code/modules/mob/living/living_defense.dm

@@ -326,8 +326,8 @@
 
 /mob/living/ex_act(severity, target, origin)
 	if(origin && istype(origin, /datum/spacevine_mutation) && isvineimmune(src))
-		return
-	..()
+		return FALSE
+	return ..()
 
 //Looking for irradiate()? It's been moved to radiation.dm under the rad_act() for mobs.
 

code/modules/mob/living/silicon/ai/ai_defense.dm

@@ -41,13 +41,13 @@
 
 /mob/living/silicon/ai/ex_act(severity, target)
 	switch(severity)
-		if(1)
+		if(EXPLODE_DEVASTATE)
 			gib()
-		if(2)
+		if(EXPLODE_HEAVY)
 			if (stat != DEAD)
 				adjustBruteLoss(60)
 				adjustFireLoss(60)
-		if(3)
+		if(EXPLODE_LIGHT)
 			if (stat != DEAD)
 				adjustBruteLoss(30)
 

code/modules/mob/living/silicon/pai/pai_defense.dm

@@ -30,13 +30,13 @@
 /mob/living/silicon/pai/ex_act(severity, target)
 	take_holo_damage(severity * 50)
 	switch(severity)
-		if(1) //RIP
+		if(EXPLODE_DEVASTATE) //RIP
 			qdel(card)
 			qdel(src)
-		if(2)
+		if(EXPLODE_HEAVY)
 			fold_in(force = 1)
 			Paralyze(400)
-		if(3)
+		if(EXPLODE_LIGHT)
 			fold_in(force = 1)
 			Paralyze(200)
 

code/modules/mob/living/silicon/robot/robot_defense.dm

@@ -393,14 +393,14 @@ GLOBAL_LIST_INIT(blacklisted_borg_hats, typecacheof(list( //Hats that don't real
 
 /mob/living/silicon/robot/ex_act(severity, target)
 	switch(severity)
-		if(1)
+		if(EXPLODE_DEVASTATE)
 			gib()
 			return
-		if(2)
+		if(EXPLODE_HEAVY)
 			if (stat != DEAD)
 				adjustBruteLoss(60)
 				adjustFireLoss(60)
-		if(3)
+		if(EXPLODE_LIGHT)
 			if (stat != DEAD)
 				adjustBruteLoss(30)
 

code/modules/mob/living/simple_animal/animal_defense.dm

@@ -142,8 +142,9 @@
 
 /mob/living/simple_animal/ex_act(severity, target, origin)
 	if(origin && istype(origin, /datum/spacevine_mutation) && isvineimmune(src))
-		return
-	..()
+		return FALSE
+
+	. = ..()
 	if(QDELETED(src))
 		return
 	var/bomb_armor = getarmor(null, BOMB)
@@ -160,7 +161,7 @@
 				bloss = bloss / 1.5
 			adjustBruteLoss(bloss)
 
-		if(EXPLODE_LIGHT)
+		if (EXPLODE_LIGHT)
 			var/bloss = 30
 			if(prob(bomb_armor))
 				bloss = bloss / 1.5

code/modules/mob/living/simple_animal/bot/mulebot.dm

@@ -213,12 +213,12 @@
 /mob/living/simple_animal/bot/mulebot/ex_act(severity)
 	unload(0)
 	switch(severity)
-		if(1)
+		if(EXPLODE_DEVASTATE)
 			qdel(src)
-		if(2)
-			for(var/i = 1; i < 3; i++)
-				wires.cut_random()
-		if(3)
+		if(EXPLODE_HEAVY)
+			wires.cut_random()
+			wires.cut_random()
+		if(EXPLODE_LIGHT)
 			wires.cut_random()
 
 

code/modules/mob/living/simple_animal/guardian/guardian.dm

@@ -270,12 +270,12 @@ GLOBAL_LIST_EMPTY(parasites) //all currently existing/living guardians
 
 /mob/living/simple_animal/hostile/guardian/ex_act(severity, target)
 	switch(severity)
-		if(1)
+		if(EXPLODE_DEVASTATE)
 			gib()
-			return
-		if(2)
+			return TRUE
+		if(EXPLODE_HEAVY)
 			adjustBruteLoss(60)
-		if(3)
+		if(EXPLODE_LIGHT)
 			adjustBruteLoss(30)
 
 /mob/living/simple_animal/hostile/guardian/gib()

code/modules/mob/living/simple_animal/guardian/types/protector.dm

@@ -13,12 +13,12 @@
 	var/toggle = FALSE
 
 /mob/living/simple_animal/hostile/guardian/protector/ex_act(severity)
-	if(severity == 1)
+	if(severity == EXPLODE_DEVASTATE)
 		adjustBruteLoss(400) //if in protector mode, will do 20 damage and not actually necessarily kill the summoner
 	else
-		..()
+		. = ..()
 	if(QDELETED(src))
-		return
+		return FALSE
 	if(toggle)
 		visible_message("<span class='danger'>The explosion glances off [src]'s energy shielding!</span>")
 

code/modules/mob/living/simple_animal/hostile/cockroach.dm

@@ -74,7 +74,7 @@
 	..()
 
 /mob/living/simple_animal/hostile/cockroach/ex_act() //Explosions are a terrible way to handle a cockroach.
-	return
+	return FALSE
 
 /mob/living/simple_animal/hostile/cockroach/hauberoach
 	name = "hauberoach"

code/modules/mob/living/simple_animal/hostile/megafauna/blood_drunk_miner.dm

@@ -140,7 +140,7 @@ Difficulty: Medium
 
 /mob/living/simple_animal/hostile/megafauna/blood_drunk_miner/ex_act(severity, target)
 	if(dash())
-		return
+		return FALSE
 	return ..()
 
 /mob/living/simple_animal/hostile/megafauna/blood_drunk_miner/MeleeAction(patience = TRUE)

code/modules/mob/living/simple_animal/hostile/megafauna/bubblegum.dm

@@ -439,7 +439,8 @@ Difficulty: Hard
 
 /mob/living/simple_animal/hostile/megafauna/bubblegum/ex_act(severity, target)
 	if(severity >= EXPLODE_LIGHT)
-		return
+		return FALSE
+
 	severity = EXPLODE_LIGHT // puny mortals
 	return ..()
 

code/modules/mob/living/simple_animal/hostile/megafauna/demonic_frost_miner.dm

@@ -151,7 +151,7 @@ Difficulty: Extremely Hard
 		target.ex_act(EXPLODE_HEAVY)
 
 /mob/living/simple_animal/hostile/megafauna/demonic_frost_miner/ex_act(severity, target)
-	adjustBruteLoss(30 * severity - 120)
+	adjustBruteLoss((30 * severity) - 120)
 	visible_message("<span class='danger'>[src] absorbs the explosion!</span>", "<span class='userdanger'>You absorb the explosion!</span>")
 
 /mob/living/simple_animal/hostile/megafauna/demonic_frost_miner/Goto(target, delay, minimum_distance)

code/modules/mob/living/simple_animal/hostile/megafauna/drake.dm

@@ -402,8 +402,8 @@
 
 /mob/living/simple_animal/hostile/megafauna/dragon/ex_act(severity, target)
 	if(severity == EXPLODE_LIGHT)
-		return
-	..()
+		return FALSE
+	return ..()
 
 /mob/living/simple_animal/hostile/megafauna/dragon/adjustHealth(amount, updating_health = TRUE, forced = FALSE)
 	if(!forced && (swooping & SWOOP_INVULNERABLE))

code/modules/mob/living/simple_animal/hostile/mining_mobs/basilisk.dm

@@ -62,11 +62,11 @@
 
 /mob/living/simple_animal/hostile/asteroid/basilisk/ex_act(severity, target)
 	switch(severity)
-		if(1)
+		if(EXPLODE_DEVASTATE)
 			gib()
-		if(2)
+		if(EXPLODE_HEAVY)
 			adjustBruteLoss(140)
-		if(3)
+		if(EXPLODE_LIGHT)
 			adjustBruteLoss(110)
 
 /mob/living/simple_animal/hostile/asteroid/basilisk/AttackingTarget()

code/modules/modular_computers/computers/machinery/modular_computer.dm

@@ -128,15 +128,17 @@
 // Stronger explosions cause serious damage to internal components
 // Minor explosions are mostly mitigitated by casing.
 /obj/machinery/modular_computer/ex_act(severity)
-	if(cpu)
-		switch(severity)
-			if(EXPLODE_DEVASTATE)
-				SSexplosions.high_mov_atom += cpu
-			if(EXPLODE_HEAVY)
-				SSexplosions.med_mov_atom += cpu
-			if(EXPLODE_LIGHT)
-				SSexplosions.low_mov_atom += cpu
-	..()
+	if(!cpu)
+		return ..()
+
+	switch(severity)
+		if(EXPLODE_DEVASTATE)
+			SSexplosions.high_mov_atom += cpu
+		if(EXPLODE_HEAVY)
+			SSexplosions.med_mov_atom += cpu
+		if(EXPLODE_LIGHT)
+			SSexplosions.low_mov_atom += cpu
+	return ..()
 
 // EMPs are similar to explosions, but don't cause physical damage to the casing. Instead they screw up the components
 /obj/machinery/modular_computer/emp_act(severity)

code/modules/power/cell.dm

@@ -136,15 +136,17 @@
 		charge = 0
 
 /obj/item/stock_parts/cell/ex_act(severity, target)
-	..()
-	if(!QDELETED(src))
-		switch(severity)
-			if(2)
-				if(prob(50))
-					corrupt()
-			if(3)
-				if(prob(25))
-					corrupt()
+	. = ..()
+	if(QDELETED(src))
+		return
+
+	switch(severity)
+		if(EXPLODE_HEAVY)
+			if(prob(50))
+				corrupt()
+		if(EXPLODE_LIGHT)
+			if(prob(25))
+				corrupt()
 
 /obj/item/stock_parts/cell/attack_self(mob/user)
 	if(isethereal(user))

code/modules/power/gravitygenerator.dm

@@ -38,7 +38,7 @@ GLOBAL_LIST_EMPTY(gravity_generators) // We will keep track of this by adding ne
 	return FALSE
 
 /obj/machinery/gravity_generator/ex_act(severity, target)
-	if(severity == 1) // Very sturdy.
+	if(severity == EXPLODE_DEVASTATE) // Very sturdy.
 		set_broken()
 
 /obj/machinery/gravity_generator/blob_act(obj/structure/blob/B)

code/modules/power/singularity/singularity.dm

@@ -121,17 +121,17 @@
 
 /obj/singularity/ex_act(severity, target)
 	switch(severity)
-		if(1)
+		if(EXPLODE_DEVASTATE)
 			if(current_size <= STAGE_TWO)
 				investigate_log("has been destroyed by a heavy explosion.", INVESTIGATE_SINGULO)
 				qdel(src)
 				return
-			else
-				energy -= round(((energy+1)/2),1)
-		if(2)
-			energy -= round(((energy+1)/3),1)
-		if(3)
-			energy -= round(((energy+1)/4),1)
+
+			energy -= round(((energy + 1) / 2), 1)
+		if(EXPLODE_HEAVY)
+			energy -= round(((energy + 1) / 3), 1)
+		if(EXPLODE_LIGHT)
+			energy -= round(((energy + 1) / 4), 1)
 
 /obj/singularity/process(delta_time)
 	if(current_size >= STAGE_TWO)

code/modules/projectiles/guns/misc/blastcannon.dm

@@ -171,4 +171,4 @@
 		return
 
 /obj/projectile/blastwave/ex_act()
-	return
+	return FALSE

code/modules/reagents/chemistry/machinery/chem_dispenser.dm

@@ -162,19 +162,22 @@
 	obj_flags |= EMAGGED
 
 /obj/machinery/chem_dispenser/ex_act(severity, target)
-	if(severity < 3)
-		..()
+	if(severity >= EXPLODE_LIGHT) // Note that the explosion defines are inverted. Stronger explosions have smaller numbers.
+		return FALSE
+	return ..()
 
 /obj/machinery/chem_dispenser/contents_explosion(severity, target)
 	..()
-	if(beaker)
-		switch(severity)
-			if(EXPLODE_DEVASTATE)
-				SSexplosions.high_mov_atom += beaker
-			if(EXPLODE_HEAVY)
-				SSexplosions.med_mov_atom += beaker
-			if(EXPLODE_LIGHT)
-				SSexplosions.low_mov_atom += beaker
+	if(!beaker)
+		return
+
+	switch(severity)
+		if(EXPLODE_DEVASTATE)
+			SSexplosions.high_mov_atom += beaker
+		if(EXPLODE_HEAVY)
+			SSexplosions.med_mov_atom += beaker
+		if(EXPLODE_LIGHT)
+			SSexplosions.low_mov_atom += beaker
 
 /obj/machinery/chem_dispenser/handle_atom_del(atom/A)
 	..()

code/modules/reagents/chemistry/machinery/chem_master.dm

@@ -65,26 +65,27 @@
 		reagents.maximum_volume += B.reagents.maximum_volume
 
 /obj/machinery/chem_master/ex_act(severity, target)
-	if(severity < 3)
-		..()
+	if(severity >= EXPLODE_LIGHT) // This actually makes the dispenser immune to explosions at least as weak as [EXPLODE_LIGHT]. Don't ask me why the defines are inverted. I don't know.
+		return FALSE
+	return ..()
 
 /obj/machinery/chem_master/contents_explosion(severity, target)
-	..()
-	if(beaker)
-		switch(severity)
-			if(EXPLODE_DEVASTATE)
+	. = ..()
+	switch(severity)
+		if(EXPLODE_DEVASTATE)
+			if(beaker)
 				SSexplosions.high_mov_atom += beaker
-			if(EXPLODE_HEAVY)
-				SSexplosions.med_mov_atom += beaker
-			if(EXPLODE_LIGHT)
-				SSexplosions.low_mov_atom += beaker
-	if(bottle)
-		switch(severity)
-			if(EXPLODE_DEVASTATE)
+			if(bottle)
 				SSexplosions.high_mov_atom += bottle
-			if(EXPLODE_HEAVY)
+		if(EXPLODE_HEAVY)
+			if(beaker)
+				SSexplosions.med_mov_atom += beaker
+			if(bottle)
 				SSexplosions.med_mov_atom += bottle
-			if(EXPLODE_LIGHT)
+		if(EXPLODE_LIGHT)
+			if(beaker)
+				SSexplosions.low_mov_atom += beaker
+			if(bottle)
 				SSexplosions.low_mov_atom += bottle
 
 /obj/machinery/chem_master/handle_atom_del(atom/A)

code/modules/reagents/chemistry/machinery/reagentgrinder.dm

@@ -52,14 +52,16 @@
 	return ..()
 
 /obj/machinery/reagentgrinder/contents_explosion(severity, target)
-	if(beaker)
-		switch(severity)
-			if(EXPLODE_DEVASTATE)
-				SSexplosions.high_mov_atom += beaker
-			if(EXPLODE_HEAVY)
-				SSexplosions.med_mov_atom += beaker
-			if(EXPLODE_LIGHT)
-				SSexplosions.low_mov_atom += beaker
+	if(!beaker)
+		return
+
+	switch(severity)
+		if(EXPLODE_DEVASTATE)
+			SSexplosions.high_mov_atom += beaker
+		if(EXPLODE_HEAVY)
+			SSexplosions.med_mov_atom += beaker
+		if(EXPLODE_LIGHT)
+			SSexplosions.low_mov_atom += beaker
 
 /obj/machinery/reagentgrinder/RefreshParts()
 	speed = 1

code/modules/reagents/reagent_containers.dm

@@ -134,7 +134,7 @@
 		for(var/datum/reagent/R in reagents.reagent_list)
 			R.on_ex_act()
 	if(!QDELETED(src))
-		..()
+		return ..()
 
 /obj/item/reagent_containers/fire_act(exposed_temperature, exposed_volume)
 	reagents.expose_temperature(exposed_temperature)

code/modules/recycling/disposal/holder.dm

@@ -144,4 +144,4 @@
 	return TRUE
 
 /obj/structure/disposalholder/ex_act(severity, target)
-	return
+	return FALSE

code/modules/recycling/disposal/pipe.dm

@@ -119,8 +119,7 @@
 // pipe affected by explosion
 /obj/structure/disposalpipe/contents_explosion(severity, target)
 	var/obj/structure/disposalholder/H = locate() in src
-	if(H)
-		H.contents_explosion(severity, target)
+	H?.contents_explosion(severity, target)
 
 
 //welding tool: unfasten and convert to obj/disposalconstruct

code/modules/recycling/sortingmachinery.dm

@@ -26,14 +26,13 @@
 	return ..()
 
 /obj/structure/big_delivery/contents_explosion(severity, target)
-	for(var/thing in contents)
-		switch(severity)
-			if(EXPLODE_DEVASTATE)
-				SSexplosions.high_mov_atom += thing
-			if(EXPLODE_HEAVY)
-				SSexplosions.med_mov_atom += thing
-			if(EXPLODE_LIGHT)
-				SSexplosions.low_mov_atom += thing
+	switch(severity)
+		if(EXPLODE_DEVASTATE)
+			SSexplosions.high_mov_atom += contents
+		if(EXPLODE_HEAVY)
+			SSexplosions.med_mov_atom += contents
+		if(EXPLODE_LIGHT)
+			SSexplosions.low_mov_atom += contents
 
 /obj/structure/big_delivery/examine(mob/user)
 	. = ..()
@@ -177,14 +176,13 @@
 	var/obj/item/barcode/sticker
 
 /obj/item/small_delivery/contents_explosion(severity, target)
-	for(var/thing in contents)
-		switch(severity)
-			if(EXPLODE_DEVASTATE)
-				SSexplosions.high_mov_atom += thing
-			if(EXPLODE_HEAVY)
-				SSexplosions.med_mov_atom += thing
-			if(EXPLODE_LIGHT)
-				SSexplosions.low_mov_atom += thing
+	switch(severity)
+		if(EXPLODE_DEVASTATE)
+			SSexplosions.high_mov_atom += contents
+		if(EXPLODE_HEAVY)
+			SSexplosions.med_mov_atom += contents
+		if(EXPLODE_LIGHT)
+			SSexplosions.low_mov_atom += contents
 
 /obj/item/small_delivery/attack_self(mob/user)
 	to_chat(user, "<span class='notice'>You start to unwrap the package...</span>")

code/modules/research/xenobiology/crossbreeding/burning.dm

@@ -262,12 +262,13 @@ Burning extracts:
 	user.visible_message("<span class='warning'>[user] activates [src]. It's going to explode!</span>", "<span class='danger'>You activate [src]. It crackles in anticipation</span>")
 	addtimer(CALLBACK(src, .proc/boom), 50)
 
+/// Inflicts a blastwave upon every mob within a small radius.
 /obj/item/slimecross/burning/oil/proc/boom()
 	var/turf/T = get_turf(src)
 	playsound(T, 'sound/effects/explosion2.ogg', 200, TRUE)
-	for(var/mob/living/M in range(2, T))
-		new /obj/effect/temp_visual/explosion(get_turf(M))
-		M.ex_act(EXPLODE_HEAVY)
+	for(var/mob/living/target in range(2, T))
+		new /obj/effect/temp_visual/explosion(get_turf(target))
+		SSexplosions.med_mov_atom += target
 	qdel(src)
 
 /obj/item/slimecross/burning/black

code/modules/shuttle/special.dm

@@ -44,7 +44,7 @@
 	return
 
 /obj/machinery/power/emitter/energycannon/magical/ex_act(severity)
-	return
+	return FALSE
 
 /obj/machinery/power/emitter/energycannon/magical/emag_act(mob/user)
 	return

code/modules/station_goals/bsa.dm

@@ -227,7 +227,7 @@
 	var/obj/machinery/parent
 
 /obj/structure/filler/ex_act()
-	return
+	return FALSE
 
 /obj/machinery/computer/bsa_control
 	name = "bluespace artillery control"

code/modules/vehicles/mecha/mecha_defense.dm

@@ -122,31 +122,33 @@
 	if(prob(deflect_chance))
 		severity++
 		log_message("Armor saved, changing severity to [severity]", LOG_MECHA)
-	. = ..()
+	return ..()
 
 /obj/vehicle/sealed/mecha/contents_explosion(severity, target)
 	severity++
-	for(var/X in equipment)
-		var/obj/item/mecha_parts/mecha_equipment/ME = X
-		switch(severity)
-			if(EXPLODE_DEVASTATE)
-				SSexplosions.high_mov_atom += ME
-			if(EXPLODE_HEAVY)
-				SSexplosions.med_mov_atom += ME
-			if(EXPLODE_LIGHT)
-				SSexplosions.low_mov_atom += ME
-	for(var/Y in trackers)
-		var/obj/item/mecha_parts/mecha_tracking/MT = Y
-		switch(severity)
-			if(EXPLODE_DEVASTATE)
-				SSexplosions.high_mov_atom += MT
-			if(EXPLODE_HEAVY)
-				SSexplosions.med_mov_atom += MT
-			if(EXPLODE_LIGHT)
-				SSexplosions.low_mov_atom += MT
-	for(var/Z in occupants)
-		var/mob/living/occupant = Z
-		occupant.ex_act(severity,target)
+
+	switch(severity)
+		if(EXPLODE_DEVASTATE)
+			if(equipment)
+				SSexplosions.high_mov_atom += equipment
+			if(trackers)
+				SSexplosions.high_mov_atom += trackers
+			if(occupants)
+				SSexplosions.high_mov_atom += occupants
+		if(EXPLODE_HEAVY)
+			if(equipment)
+				SSexplosions.med_mov_atom += equipment
+			if(trackers)
+				SSexplosions.med_mov_atom += trackers
+			if(occupants)
+				SSexplosions.med_mov_atom += occupants
+		if(EXPLODE_LIGHT)
+			if(equipment)
+				SSexplosions.low_mov_atom += equipment
+			if(trackers)
+				SSexplosions.low_mov_atom += trackers
+			if(occupants)
+				SSexplosions.low_mov_atom += occupants
 
 /obj/vehicle/sealed/mecha/handle_atom_del(atom/A)
 	if(A in occupants)