Merge pull request #10455 from Ghommie/Ghommie-cit501

Porting some runtime fixes.

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

@@ -151,7 +151,8 @@
 	return
 
 /mob/living/simple_animal/bot/mulebot/bullet_act(obj/item/projectile/Proj)
-	if(..())
+	. = ..()
+	if(. && !QDELETED(src)) //Got hit and not blown up yet.
 		if(prob(50) && !isnull(load))
 			unload(0)
 		if(prob(25))

code/modules/mob/living/simple_animal/hostile/mining_mobs/elites/elite.dm

@@ -240,7 +240,8 @@ obj/structure/elite_tumor/proc/return_elite()
 	INVOKE_ASYNC(src, .proc/fighters_check)  //Checks to see if our fighters died.
 	INVOKE_ASYNC(src, .proc/arena_trap)  //Gets another arena trap queued up for when this one runs out.
 	INVOKE_ASYNC(src, .proc/border_check)  //Checks to see if our fighters got out of the arena somehow.
-	addtimer(CALLBACK(src, .proc/arena_checks), 50)
+	if(!QDELETED(src))
+		addtimer(CALLBACK(src, .proc/arena_checks), 50)
 
 /obj/structure/elite_tumor/proc/fighters_check()
 	if(activator != null && activator.stat == DEAD || activity == TUMOR_ACTIVE && QDELETED(activator))

code/modules/surgery/bodyparts/dismemberment.dm

@@ -22,11 +22,14 @@
 	SEND_SIGNAL(C, COMSIG_ADD_MOOD_EVENT, "dismembered", /datum/mood_event/dismembered)
 	drop_limb()
 
+	C.bleed(40)
+
+	if(QDELETED(src)) //Could have dropped into lava/explosion/chasm/whatever
+		return TRUE
 	if(dam_type == BURN)
 		burn()
-		return 1
+		return TRUE
 	add_mob_blood(C)
-	C.bleed(40)
 	var/direction = pick(GLOB.cardinals)
 	var/t_range = rand(2,max(throw_range/2, 2))
 	var/turf/target_turf = get_turf(src)
@@ -38,7 +41,7 @@
 		if(new_turf.density)
 			break
 	throw_at(target_turf, throw_range, throw_speed)
-	return 1
+	return TRUE
 
 
 /obj/item/bodypart/chest/dismember()
@@ -149,7 +152,6 @@
 		LB.brainmob = brainmob
 		brainmob = null
 		LB.brainmob.forceMove(LB)
-		LB.brainmob.container = LB
 		LB.brainmob.stat = DEAD
 
 /obj/item/organ/eyes/transfer_to_limb(obj/item/bodypart/head/LB, mob/living/carbon/human/C)