improves check_body_part_coverage(), makes it easier to splash grays (#13288)

Author: Sprok0

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

@@ -76,10 +76,14 @@ emp_act
 /mob/living/carbon/human/proc/check_body_part_coverage(var/body_part_flags=0)
 	if(!body_part_flags)
 		return 0
+	var/parts_to_check = body_part_flags
 	for(var/obj/item/clothing/C in get_clothing_items())
 		if(!C)
 			continue
-		if(C.body_parts_covered & body_part_flags)
+		if((C.body_parts_covered & body_part_flags) == body_part_flags)
+			return 1
+		parts_to_check &= ~(C.body_parts_covered)
+		if(!parts_to_check)
 			return 1
 	return 0
 

code/modules/reagents/Chemistry-Reagents.dm

@@ -376,15 +376,11 @@
 	//Greys treat water like acid
 	if(ishuman(M))
 		var/mob/living/carbon/human/H = M
-		if(H.species.name == "Grey")
+		if(isgrey(H))
 			if(method == TOUCH)
 
-				if(H.wear_mask)
-					to_chat(H, "<span class='warning'>Your mask protects you from the water!</span>")
-					return
-
-				if(H.head)
-					to_chat(H, "<span class='warning'>Your helmet protects you from the water!</span>")
+				if(H.check_body_part_coverage(EYES|MOUTH))
+					to_chat(H, "<span class='warning'>Your face is protected from a splash of water!</span>")
 					return
 
 				if(M.acidable())