Cobb would've been content to walk back in silence but apparently she didn't agree with that. He looks over at her with an eyebrow raised.

"So? What? You got more questions for me?" Cobb figures that's it or that she wants to talk about the snow creatures so more.

Either way, the door is open now if she wants to talk. He may or may not answer her questions but that she'll figure out eventually. Cobb doesn't mind a good conversation but he isn't about to tell a stranger all his secrets. No point in that.