diff --git a/code/game/gamemodes/nuclear/nuclear.dm b/code/game/gamemodes/nuclear/nuclear.dm
index b5dc159caf0..553b8d2f59e 100644
--- a/code/game/gamemodes/nuclear/nuclear.dm
+++ b/code/game/gamemodes/nuclear/nuclear.dm
@@ -188,6 +188,9 @@
 	M.regenerate_icons()
 	M.update_body()
 
+	if(!the_bomb)
+		the_bomb = locate(/obj/machinery/nuclearbomb/syndicate) in GLOB.poi_list
+
 	if(the_bomb)
 		synd_mind.store_memory("<B>Syndicate [the_bomb.name] Code</B>: [the_bomb.r_code]")
 		to_chat(synd_mind.current, "The code for \the [the_bomb.name] is: <B>[the_bomb.r_code]</B>")
diff --git a/code/game/objects/items/tools/tool_behaviour.dm b/code/game/objects/items/tools/tool_behaviour.dm
index 136bea77e6a..8770c1d6383 100644
--- a/code/game/objects/items/tools/tool_behaviour.dm
+++ b/code/game/objects/items/tools/tool_behaviour.dm
@@ -57,4 +57,8 @@
 
 // Used in a callback that is passed by use_tool into do_after call. Do not override, do not call manually.
 /obj/item/proc/tool_check_callback(mob/living/user, atom/target, amount, datum/callback/extra_checks)
-	return tool_use_check(user, amount) && (extra_checks && !extra_checks.Invoke())
+	if(!tool_use_check(user, amount))
+		return TRUE
+	if(extra_checks && !extra_checks.Invoke())
+		return TRUE
+	return FALSE
diff --git a/code/game/objects/items/tools/welder.dm b/code/game/objects/items/tools/welder.dm
index 8ab4c12cf0f..6feb76fa8df 100644
--- a/code/game/objects/items/tools/welder.dm
+++ b/code/game/objects/items/tools/welder.dm
@@ -16,7 +16,7 @@
 	w_class = WEIGHT_CLASS_SMALL
 	armor = list("melee" = 0, "bullet" = 0, "laser" = 0, "energy" = 0, "bomb" = 0, "bio" = 0, "rad" = 0, "fire" = 100, "acid" = 30)
 	resistance_flags = FIRE_PROOF
-	materials = list(MAT_METAL=70, MAT_GLASS=30)
+	materials = list(MAT_METAL = 70, MAT_GLASS = 20)
 	origin_tech = "engineering=1;plasmatech=1"
 	tool_behaviour = TOOL_WELDER
 	toolspeed = 1
@@ -131,7 +131,7 @@
 
 /obj/item/weldingtool/tool_check_callback(mob/living/user, amount, datum/callback/extra_checks)
 	. = ..()
-	if(. && user)
+	if(!. && user)
 		if(progress_flash_divisor == 0)
 			user.flash_eyes(min(light_intensity, 1))
 			progress_flash_divisor = initial(progress_flash_divisor)
diff --git a/code/game/objects/structures/crates_lockers/closets/secure/secure_closets.dm b/code/game/objects/structures/crates_lockers/closets/secure/secure_closets.dm
index 8bf44346e72..2bf2b03b4a2 100644
--- a/code/game/objects/structures/crates_lockers/closets/secure/secure_closets.dm
+++ b/code/game/objects/structures/crates_lockers/closets/secure/secure_closets.dm
@@ -69,6 +69,8 @@
 	togglelock(user)
 
 /obj/structure/closet/secure_closet/AltClick(mob/user)
+	if(opened)
+		return ..()
 	if(Adjacent(user))
 		togglelock(user)
 
@@ -78,7 +80,7 @@
 		locked = FALSE
 		icon_state = icon_off
 		flick(icon_broken, src)
-		to_chat(user, "<span class='notice'>You break the lock on \the [src].</span>")
+		to_chat(user, "<span class='notice'>You break the lock on [src].</span>")
 
 /obj/structure/closet/secure_closet/attack_hand(mob/user)
 	add_fingerprint(user)
diff --git a/code/modules/reagents/reagent_containers/patch.dm b/code/modules/reagents/reagent_containers/patch.dm
index 17112901b29..5a5a7c4696f 100644
--- a/code/modules/reagents/reagent_containers/patch.dm
+++ b/code/modules/reagents/reagent_containers/patch.dm
@@ -18,7 +18,8 @@
 		return FALSE
 	bitesize = 0
 	if(M.eat(src, user))
-		user.drop_item()
+		if(user.get_active_hand() == src)
+			user.drop_item() // Only drop if they're holding the patch directly
 		forceMove(M)
 		LAZYADD(M.processing_patches, src)
 		return TRUE
diff --git a/code/modules/ruins/lavalandruin_code/puzzle.dm b/code/modules/ruins/lavalandruin_code/puzzle.dm
index 0220498df5e..2a3ae55bd4b 100644
--- a/code/modules/ruins/lavalandruin_code/puzzle.dm
+++ b/code/modules/ruins/lavalandruin_code/puzzle.dm
@@ -194,7 +194,7 @@
 
 /obj/structure/puzzle_element
 	name = "mysterious pillar"
-	desc = "puzzling..."
+	desc = "Puzzling..."
 	icon = 'icons/obj/lavaland/artefacts.dmi'
 	icon_state = "puzzle_pillar"
 	anchored = FALSE
diff --git a/code/modules/surgery/organs/heart.dm b/code/modules/surgery/organs/heart.dm
index ee017cfa4e5..a0c2c10308e 100644
--- a/code/modules/surgery/organs/heart.dm
+++ b/code/modules/surgery/organs/heart.dm
@@ -64,8 +64,9 @@
 
 /obj/item/organ/internal/heart/prepare_eat()
 	var/obj/S = ..()
-	S.icon_state = dead_icon
-	return S
+	if(S)
+		S.icon_state = dead_icon
+		return S
 
 /obj/item/organ/internal/heart/cursed
 	name = "cursed heart"
diff --git a/code/modules/surgery/organs/lungs.dm b/code/modules/surgery/organs/lungs.dm
index 12cc87aeb3f..8250665d587 100644
--- a/code/modules/surgery/organs/lungs.dm
+++ b/code/modules/surgery/organs/lungs.dm
@@ -304,8 +304,9 @@
 
 /obj/item/organ/internal/lungs/prepare_eat()
 	var/obj/S = ..()
-	S.reagents.add_reagent("salbutamol", 5)
-	return S
+	if(S)
+		S.reagents.add_reagent("salbutamol", 5)
+		return S
 
 /obj/item/organ/internal/lungs/plasmaman
 	name = "plasma filter"
diff --git a/icons/mob/inhands/items_lefthand.dmi b/icons/mob/inhands/items_lefthand.dmi
index 0564a4b7c7b..9b9702e53c3 100644
Binary files a/icons/mob/inhands/items_lefthand.dmi and b/icons/mob/inhands/items_lefthand.dmi differ