Fixes #3081

code/game/objects/items/robot/robot_parts.dm

@@ -8,6 +8,7 @@
 	var/construction_time = 100
 	var/list/construction_cost = list("metal"=20000,"glass"=5000)
 	var/list/part = null
+	var/sabotaged = 0 //Emagging limbs can have repercussions when installed as prosthetics.
 
 /obj/item/robot_parts/l_arm
 	name = "robot left arm"
@@ -278,3 +279,13 @@
 		del(src)
 		return
 	return
+
+/obj/item/robot_parts/attackby(obj/item/W as obj, mob/user as mob)
+	if(istype(W,/obj/item/weapon/card/emag))
+		if(sabotaged)
+			user << "\red [src] is already sabotaged!"
+		else
+			user << "\red You slide [W] into the dataport on [src] and short out the safeties."
+			sabotaged = 1
+		return
+	..()

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

@@ -161,6 +161,17 @@ emp_act
 	if((user != src) && check_shields(I.force, "the [I.name]"))
 		return 0
 
+	if(istype(I,/obj/item/weapon/card/emag))
+		if(!(affecting.status & ORGAN_ROBOT))
+			user << "\red That limb isn't robotic."
+			return
+		if(affecting.sabotaged)
+			user << "\red [src]'s [affecting.display_name] is already sabotaged!"
+		else
+			user << "\red You sneakily slide [I] into the dataport on [src]'s [affecting.display_name] and short out the safeties."
+			affecting.sabotaged = 1
+		return
+
 	if(I.attack_verb.len)
 		visible_message("\red <B>[src] has been [pick(I.attack_verb)] in the [hit_area] with [I.name] by [user]!</B>")
 	else

code/modules/organs/organ_external.dm

@@ -35,6 +35,7 @@
 	var/open = 0
 	var/stage = 0
 	var/cavity = 0
+	var/sabotaged = 0 //If a prosthetic limb is emagged, it will detonate when it fails.
 
 	var/obj/item/hidden = null
 	var/list/implants = list()
@@ -482,8 +483,8 @@
 				owner.u_equip(owner.shoes)
 		if(organ)
 			destspawn = 1
-			//Robotic limbs explode until specified otherwise
-			if(status & ORGAN_ROBOT && !no_explode)
+			//Robotic limbs explode if sabotaged.
+			if(status & ORGAN_ROBOT && !no_explode && sabotaged)
 				owner.visible_message("\red \The [owner]'s [display_name] explodes violently!",\
 				"\red <b>Your [display_name] explodes!</b>",\
 				"You hear an explosion followed by a scream!")
@@ -494,10 +495,10 @@
 				spark_system.start()
 				spawn(10)
 					del(spark_system)
-			else
-				owner.visible_message("\red [owner.name]'s [display_name] flies off in an arc.",\
-				"<span class='moderate'><b>Your [display_name] goes flying off!</b></span>",\
-				"You hear a terrible sound of ripping tendons and flesh.")
+
+			owner.visible_message("\red [owner.name]'s [display_name] flies off in an arc.",\
+			"<span class='moderate'><b>Your [display_name] goes flying off!</b></span>",\
+			"You hear a terrible sound of ripping tendons and flesh.")
 
 			//Throw organs around
 			var/lol = pick(cardinal)

code/modules/surgery/generic.dm

@@ -190,7 +190,16 @@
 	max_duration = 160
 
 	can_use(mob/living/user, mob/living/carbon/human/target, target_zone, obj/item/tool)
-		return ..() && target_zone != "chest" && target_zone != "groin" && target_zone != "head"
+		if (target_zone == "eyes")	//there are specific steps for eye surgery
+			return 0
+		if (!hasorgans(target))
+			return 0
+		var/datum/organ/external/affected = target.get_organ(target_zone)
+		if (affected == null)
+			return 0
+		if (affected.status & ORGAN_DESTROYED)
+			return 0
+		return target_zone != "chest" && target_zone != "groin" && target_zone != "head"
 
 	begin_step(mob/user, mob/living/carbon/human/target, target_zone, obj/item/tool)
 		var/datum/organ/external/affected = target.get_organ(target_zone)
@@ -203,11 +212,11 @@
 		var/datum/organ/external/affected = target.get_organ(target_zone)
 		user.visible_message("\blue [user] cuts off [target]'s [affected.display_name] with \the [tool].", \
 		"\blue You cut off [target]'s [affected.display_name] with \the [tool].")
-		affected.droplimb(1,1)
+		affected.droplimb(1,0)
 
 	fail_step(mob/living/user, mob/living/carbon/human/target, target_zone, obj/item/tool)
 		var/datum/organ/external/affected = target.get_organ(target_zone)
 		user.visible_message("\red [user]'s hand slips, sawwing through the bone in [target]'s [affected.display_name] with \the [tool]!", \
 		"\red Your hand slips, sawwing through the bone in [target]'s [affected.display_name] with \the [tool]!")
 		affected.createwound(CUT, 30)
-		affected.fracture()
+		affected.fracture()

code/modules/surgery/robolimbs.dm

@@ -144,10 +144,15 @@
 		"You start attaching [tool] where [target]'s [affected.display_name] used to be.")
 
 	end_step(mob/living/user, mob/living/carbon/human/target, target_zone, obj/item/tool)
+		var/obj/item/robot_parts/L = tool
 		var/datum/organ/external/affected = target.get_organ(target_zone)
 		user.visible_message("\blue [user] has attached [tool] where [target]'s [affected.display_name] used to be.",	\
 		"\blue You have attached [tool] where [target]'s [affected.display_name] used to be.")
 		affected.robotize()
+		if(L.sabotaged)
+			affected.sabotaged = 1
+		else
+			affected.sabotaged = 0
 		target.update_body()
 		target.updatehealth()
 		target.UpdateDamageIcon()