He's not really supposed to be helping, so he doesn't offer up any clues. If anything, he's supposed to be someone on the receiving end of an interrogation, and though he doesn't imagine Danny's given her free rein to do the kind of things he was trained to withstand, he's not going to be an open book either.

Instead, he remains silent, waiting to respond until he's directly spoken to, glancing from Kate to Danny with a hint of a smirk.