Minecraft wiki entry for Snow_golems, associated text: It is also possible to make a pushing turret that knocks the mobs into a hazard, for example, a narrow pathway with golems on one side and lava on the other. Players can walk across safely, but any mob will be pushed into the lava. Keep in mind, however, that, because once hit, mobs move toward the golem, to do this requires either the mob to be killed after the first hit, or a great number of golems to provide knockback faster than the mob can walk. To kill mobs, it is generally better to use a pulling turret.