Ouch.

code/modules/antagonists/changeling/powers/mutations.dm

@@ -345,13 +345,13 @@
 /obj/item/projectile/tentacle/on_hit(atom/target, blocked = FALSE)
 	var/mob/living/carbon/human/H = firer
 	if(blocked >= 100)
-		return 0
+		return BULLET_ACT_BLOCK
 	if(isitem(target))
 		var/obj/item/I = target
 		if(!I.anchored)
 			to_chat(firer, "<span class='notice'>You pull [I] right into your grasp.</span>")
 			H.put_in_hands(I) //Because throwing it is goofy as fuck and unreliable. If you land the tentacle despite the penalties to accuracy, you should have your reward.
-			. = 1
+			. = BULLET_ACT_HIT
 
 	else if(isliving(target))
 		var/mob/living/L = target
@@ -366,7 +366,7 @@
 					if(INTENT_HELP)
 						C.visible_message("<span class='danger'>[L] is pulled by [H]'s tentacle!</span>","<span class='userdanger'>A tentacle grabs you and pulls you towards [H]!</span>")
 						C.throw_at(get_step_towards(H,C), 8, 2)
-						return 1
+						return BULLET_ACT_HIT
 
 					if(INTENT_DISARM)
 						var/obj/item/I = C.get_active_held_item()
@@ -374,27 +374,27 @@
 							if(C.dropItemToGround(I))
 								C.visible_message("<span class='danger'>[I] is yanked off [C]'s hand by [src]!</span>","<span class='userdanger'>A tentacle pulls [I] away from you!</span>")
 								on_hit(I) //grab the item as if you had hit it directly with the tentacle
-								return 1
+								return BULLET_ACT_HIT
 							else
 								to_chat(firer, "<span class='danger'>You can't seem to pry [I] off [C]'s hands!</span>")
-								return 0
+								return BULLET_ACT_BLOCK
 						else
 							to_chat(firer, "<span class='danger'>[C] has nothing in hand to disarm!</span>")
-							return 0
+							return BULLET_ACT_HIT
 
 					if(INTENT_GRAB)
 						C.visible_message("<span class='danger'>[L] is grabbed by [H]'s tentacle!</span>","<span class='userdanger'>A tentacle grabs you and pulls you towards [H]!</span>")
 						C.throw_at(get_step_towards(H,C), 8, 2, H, TRUE, TRUE, callback=CALLBACK(src, .proc/tentacle_grab, H, C))
-						return 1
+						return BULLET_ACT_HIT
 
 					if(INTENT_HARM)
 						C.visible_message("<span class='danger'>[L] is thrown towards [H] by a tentacle!</span>","<span class='userdanger'>A tentacle grabs you and throws you towards [H]!</span>")
 						C.throw_at(get_step_towards(H,C), 8, 2, H, TRUE, TRUE, callback=CALLBACK(src, .proc/tentacle_stab, H, C))
-						return 1
+						return BULLET_ACT_HIT
 			else
 				L.visible_message("<span class='danger'>[L] is pulled by [H]'s tentacle!</span>","<span class='userdanger'>A tentacle grabs you and pulls you towards [H]!</span>")
 				L.throw_at(get_step_towards(H,L), 8, 2)
-				. = 1
+				. = BULLET_ACT_HIT
 
 /obj/item/projectile/tentacle/Destroy()
 	qdel(chain)

code/modules/antagonists/clockcult/clock_helpers/slab_abilities.dm

@@ -182,7 +182,7 @@
 	if(isliving(target))
 		var/mob/living/L = target
 		if(is_servant_of_ratvar(L) || L.stat || L.has_status_effect(STATUS_EFFECT_KINDLE))
-			return
+			return BULLET_ACT_HIT
 		var/atom/O = L.anti_magic_check()
 		playsound(L, 'sound/magic/fireball.ogg', 50, TRUE, frequency = 1.25)
 		if(O)

code/modules/antagonists/clockcult/clock_mobs/clockwork_marauder.dm

@@ -97,7 +97,7 @@
 
 /mob/living/simple_animal/hostile/clockwork/marauder/bullet_act(obj/item/projectile/P)
 	if(deflect_projectile(P))
-		return
+		return BULLET_ACT_BLOCK
 	return ..()
 
 /mob/living/simple_animal/hostile/clockwork/marauder/proc/deflect_projectile(obj/item/projectile/P)

code/modules/antagonists/clockcult/clock_structures/reflector.dm

@@ -31,7 +31,7 @@
 	if(auto_reflect(P, P.dir, get_turf(P), P.Angle) != -1)
 		return ..()
 
-	return -1
+	return BULLET_ACT_FORCE_PIERCE
 
 /obj/structure/destructible/clockwork/reflector/proc/auto_reflect(obj/item/projectile/P, pdir, turf/ploc, pangle)