Yes, the question is the mystery. That's why it's interesting, because it has to be one of a few improbable options. "Something" convincing 9 experienced outdo

Yes, the question is the mystery. That's why it's interesting, because it has to be one of a few improbable options. "Something" convincing 9 experienced outdoorsman to slice open their tent (why not open the door?) and flee is a pretty crazy story. Add the other things that don't easily fit a plausible explanation, and it's really interesting.