Killing him wouldn't hold him for long. A week, until he comes back. I don't know why they left him here. Maybe they figured leaving him to us was a worse fate than anything they could do to him.

[He pauses, and adds an afterthought.]

...if some people had their way, that'd be true.

[He shakes his head.]

And I don't know. He said that there'd be a voluntary experiment to test some kind of dimensional anchor? Allowing people to anchor into different worlds, or something. I don't know how it works, it's way too complicated for me to understand. But he was supposed to be running it...