Fixes projectiles embedding in mobs that they pass through

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

@@ -38,9 +38,9 @@ emp_act
 				return -1 // complete projectile permutation
 
 	//Shrapnel
-	if (P.damage_type == BRUTE)
+	if (P.can_embed())
 		var/armor = getarmor_organ(organ, "bullet")
-		if((P.embed && prob(20 + max(P.damage - armor, -10))))
+		if(P.embed && prob(20 + max(P.damage - armor, -10)))
 			var/obj/item/weapon/shard/shrapnel/SP = new()
 			SP.name = (P.name != "shrapnel")? "[P.name] shrapnel" : "shrapnel"
 			SP.desc = "[SP.desc] It looks like it was fired from [P.shot_from]."

code/modules/projectiles/projectile.dm

@@ -65,8 +65,19 @@
 /obj/item/projectile/proc/on_impact(var/atom/A)
 	return
 
+//Checks if the projectile is eligible for embedding. Not that it necessarily will.
+//Mainly used to ensure that projectiles won't embed if they are penetrating the mob.
+/obj/item/projectile/proc/can_embed()
+	//embed must be enabled and damage type must be brute
+	if(!embed || damage_type != BRUTE)
+		return 0
+	//can't embed if the projectile is penetrating through the mob
+	if(penetrating > 0 && damage > 20 && prob(damage))
+		return 0
+	return 1
+
 //return 1 if the projectile should be allowed to pass through after all, 0 if not.
-/obj/item/projectile/proc/on_penetrate(var/atom/A)
+/obj/item/projectile/proc/check_penetrate(var/atom/A)
 	return 1
 
 /obj/item/projectile/proc/check_fire(atom/target as mob, var/mob/living/user as mob)  //Checks if you can hit them or not.
@@ -195,9 +206,9 @@
 			for(var/mob/M in A)
 				attack_mob(M, distance)
 
-	//penetrating projectiles can pass through things that otherwise would not let them
+	//penetrating projectiles can pass through things that otherwise would not let them
 	if(!passthrough && penetrating > 0)
-		if(on_penetrate(A))
+		if(check_penetrate(A))
 			passthrough = 1
 		penetrating--
 
@@ -300,4 +311,4 @@
 	trace.firer = user
 	var/output = trace.process() //Test it!
 	del(trace) //No need for it anymore
-	return output //Send it back to the gun!
+	return output //Send it back to the gun!

code/modules/projectiles/projectile/bullets.dm

@@ -13,16 +13,17 @@
 		var/mob/living/L = target
 		shake_camera(L, 3, 2)
 
-/obj/item/projectile/bullet/on_penetrate(var/atom/A)
+/obj/item/projectile/bullet/check_penetrate(var/atom/A)
-	if(!A || !A.density) return 1 //if whatever it was got destroyed when we hit it, then I guess we can just keep going
+	if(!A || !A.density) return 1 //if whatever it was got destroyed when we hit it, then I guess we can just keep going
 
 	if(istype(A, /obj/mecha))
 		return 1 //mecha have their own penetration handling
 
 	if(ismob(A))
 		if(iscarbon(A))
-			if (damage <= 20 && !prob(damage)) return 0
+			//squishy mobs absorb KE
-			damage *= 0.7 //squishy mobs absorb KE
+			if(can_embed()) return 0
+			damage *= 0.7
 		return 1
 
 	var/chance = 0