His lips twitch in barely restrained amusement as she struggles, feeling a little bad for it.

"When I'm on duty?" he repeats. "Only then? I might need to start going to the gym more often."

Although, in truth, he's rather glad he doesn't cut an intimidating figure. That's never really been his goal. It is funny to watch her struggle to backtrack, though. It's too easy a thing to miss.