Jack just looks confused, and annoyed that he's confused.

"Who the hell is Elazar?" he says, then he remembers he's talking to a new person and closes his eyes. Right, okay. Informative.

"This isn't your world, so there's a good chance there's no one else here from wherever you are." Jack explains. There, duty done.

And, fuck it, fine, if she's not going to move and if she's going to take an attitude about it, then Jack's going to just try to squeeze past here there.