[MIRROR] Changes some elements of punch code and shredding (#12373)

Co-authored-by: Olive <49600480+zeskorion@users.noreply.github.com>

code/game/objects/structures/grille.dm

@@ -34,7 +34,7 @@
 	var/attack_message = "kicks"
 	if(ishuman(user))
 		var/mob/living/carbon/human/H = user
-		if(H.species.can_shred(H))
+		if(H.species.can_shred(H, FALSE, 10))
 			attack_message = "mangles"
 			damage_dealt = 5
 

code/game/objects/structures/window.dm

@@ -201,8 +201,9 @@
 
 		if(ishuman(user))
 			var/mob/living/carbon/human/H = user
-			if(H.species.can_shred(H))
-				attack_generic(H,25)
+			var/shreddamage = H.species.can_shred(H, FALSE, 15)
+			if(shreddamage)
+				attack_generic(H, shreddamage + 5, "attacks")
 				return
 
 		playsound(src, 'sound/effects/glassknock.ogg', 80, 1)