Especially when they may be caused by our captors, or at least, be unnatural in some way.

[He frowns.]

I'm under the impression that there's a young woman who's been... present, during the majority of these earthquakes.

[He's heard of the common factor, too. Whether or not it's significant, he doesn't know, but as much as he keeps secrets generally, this is the kind of thing that seems it should be discussed as openly as possible.]