Minecraft wiki entry for Combat, associated text: Much like using neutral or enemy mobs as shields against arrows fired by skeletons in the regular world, it is feasible to use zombie piglins as shields against ghasts in the Nether. It is possible to injure or kill zombie piglin in this fashion without ever making them hostile to the player. If a ghast hits a zombified piglin, other zombified piglins will try to kill the ghast and will if it is close to the ground.