Mobs now flash red when hurt.

mods/ENTITIES/mcl_mobs/api.lua

@@ -453,8 +453,14 @@ local check_for_death = function(self, cause, cmi_cause)
 			self.health = self.hp_max
 		end
 
-		-- play damage sound if health was reduced
+		-- play damage sound if health was reduced and make mob flash red. 
 		if damaged then
+			self.object:set_texture_mod("^[colorize:#FF000040")
+			minetest.after(.2, function()
+				if self then
+					self.object:set_texture_mod("")
+				end
+			end)
 			mob_sound(self, self.sounds.damage)
 		end