Good answer Discofan, but not correct. I think you are considering Chekov, who has a situation somewhat similar to the crew member I referred to. Hence, I will use that for the next clue.
Clue #2. In this episode one crew member has a vaguely similar situation to what Chekov experienced in "Spectre of the Gun". But, for Chekov I would have said, "Good day for one crew member and friends are concerned. But wait, the day just got worse, at least for that crew member. All back to normal at the end". However, it seems Chekov's situation was a simulated reality, while this episode deals with a harsh reality.