[Well, that relief is gone as quickly as it had appeared, replaced by a tight tension in his shoulders.]

Yeah. But... I don't know about it being a prison, necessarily? There's no roster for inmates. A warden could just be someone for, I don't know, if somebody does something to warrant it. A precaution by the people who were in charge.

[He's looking at his shoes.]

People could volunteer for those kinds of things, too.