am I reading Shield Drones wrong? It says they just give themselves a 4+ invul. Is this supposed to coincide with wound allocation? I mean if I have a 12 man Fire Warrior Squad wounded by 6 AP 3 shots, if the shield Drone isnt upfront it cant take the saves. Even if it was, do the wounds go on it until it fails its invul save then the wounds start going on the fire warriors?