Really? Hmmmm....that's interesting. I read something about Apollo trying to do something with a hidden environmental control panel, something to do with the oxygen. He and Ellen are arguing in the bathroom of all places about what to do. Maybe (hard to believe, huh?
) Ellen does something stupid that exposes what Apollo is doing and that gets him shot. He gets plugged right in the stomach or the chest or something. True, no one has confirmed that Billy dies. Everyone's just assuming.