[HoneyBadger]

It sounds like some weird kind of bug but it might be that he was sucked into the Void for a while due to a magical effect while wearing Boots of the Planes (or whatever they're called). That or something similar. We've seen a lot of questions about that, so apparently it does happen. If I were you, I'd wait and see if he doesn't pop back up. If he's not back in a year, I'd list it in the bug thread, or possibly start a new thread, as the bug thread is getting a little unwieldy-sorry if someone already answered this one, I'm at work and we've very busy.