Seth sits opposite him, leaned forward, rubbing nervously at his hands.

It's not good news. Who knows how long 'until they decide' means. It could literally mean years. He doesn't even know what it is he's being protected from. It is taking an awful lot of effort not to jump to the worst conclusion right away. Plenty of scenarios are flashing through his mind, all of them unbearable. To Seth it reads a bit like a death sentence.

"So..." he begins, having to make an effort to keep his voice steady and reasonably calm. "I'm a prisoner. Indefinitely. Presumably with no rights, since no one has bothered to read any to me, and -- as a point of curiosity, do human rights even apply if I can't prove I'm from Earth?"

He's not taking this well.