She huffs, but it's kind of like an amused half-snort. "Don't doubt my geek creds!" It almost sounds like a complaint, but she's smiling. It may not be the best ever X-Files episode coming up, but she wanted to go with something humorous, and a good introduction to the Mulder and Scully tag-team.

She shoots him a thumbs-up in response to his fingerguns.