He takes a deep breath, because that's one hell of a question.

"There are long periods of rather lazy peace interspersed with... troubling events. Death is impermanent, and I know this because I have died once already." Watson gives her a slightly apologetic look, because he knows that sounds crazy. "We were put on an island and asked to fight to the death. Really, it wasn't a fair fight. I like to think I can hold my own, but there are people here with implausible powers, magic, because they come from worlds where those things are real. I suppose another version of myself is in line with that."