Converts bloody_hands_mob to a weakref. (#10659)

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

@@ -461,11 +461,11 @@ emp_act
 		var/obj/item/clothing/gloves/G = gloves
 		G.add_blood(source)
 		G.transfer_blood = amount
-		G.bloody_hands_mob = source
+		G.bloody_hands_mob = WEAKREF(source)
 	else
 		add_blood(source)
 		bloody_hands = amount
-		bloody_hands_mob = source
+		bloody_hands_mob = WEAKREF(source)
 	update_inv_gloves()		//updates on-mob overlays for bloody hands and/or bloody gloves
 
 /mob/living/carbon/human/proc/bloody_body(var/mob/living/source)