While I acknowledge that this episode was, obviously, full of hallucinations that drove certain characters to extremes, it's also fairly obvious that there was more than a little truth to be found in the situations. The one I'm fascinated with is Greer. For me, he's the most controversial character, as he seems to make progress in one episode, only to blow it in the next.
It's obvious that Greer has reasons not to trust Rush or Wray. I disagree that it's because of the rebellion; that was the concrete proof, sure, but Greer truly did hate both of them from day one. I don't think he'd intentionally violate orders, not yet at least, to take steps to get rid of them. But he has openly approved of 'getting rid of' Rush before, and in this episode it showed that he was ready to kill two essentially defenseless people, one of whom was begging for her life. I'm not sure Greer in his right mind would do this. But, I'd love to hear some debate about this.
How far would he go? Would he, presented a perfect opportunity to murder both Wray and Rush and get away with it, go ahead and do it? To protect his leader and his crew, surely, but also for personal reasons?