fixes xeno headslugging not working (#23317)

* fixes xeno headslugging not working

* tweak

Honestly I think the logic behind this is super fucking questionable, so have fun changing this back in like five years me

* Update code/modules/mob/living/simple_animal/hostile/headslug.dm

Co-authored-by: S34N <12197162+S34NW@users.noreply.github.com>

* Update code/modules/mob/living/simple_animal/hostile/headslug.dm

---------

Co-authored-by: S34N <12197162+S34NW@users.noreply.github.com>

code/modules/mob/living/simple_animal/hostile/headslug.dm

@@ -108,6 +108,10 @@
 		M.key = origin.key
 		M.revive() // better make sure some weird shit doesn't happen, because it has in the pas
 		M.forceMove(get_turf(owner)) // So that they are not stuck inside
+	if(!ishuman(owner))
+		owner.gib()
+		return
+		
 	owner.apply_damage(300, BRUTE, BODY_ZONE_CHEST)
 	owner.bleed(BLOOD_VOLUME_NORMAL)
 	var/obj/item/organ/external/chest = owner.get_organ(BODY_ZONE_CHEST)

code/modules/surgery/organs/organ.dm

@@ -56,17 +56,14 @@
 	..(holder)
 	if(!max_damage)
 		max_damage = min_broken_damage * 2
-	if(istype(holder))
+	if(ishuman(holder))
 		if(holder.dna)
 			dna = holder.dna.Clone()
+			if(!blood_DNA)
+				blood_DNA = list()
+			blood_DNA[dna.unique_enzymes] = dna.blood_type
 		else
 			stack_trace("[holder] spawned without a proper DNA.")
-		var/mob/living/carbon/human/H = holder
-		if(istype(H))
-			if(dna)
-				if(!blood_DNA)
-					blood_DNA = list()
-				blood_DNA[dna.unique_enzymes] = dna.blood_type
 	else
 		dna = new /datum/dna(null)
 		if(species_override)