Book quirks a curious eyebrow at the man's mannerisms. Eyes follow the trail of the sonic screwdriver, and then as it disappears into his pocket. Sure enough, Book quickly sees a set of credentials that look very official in some capacity, too fast for him to really read the fine print. And yet, he still looks at the Doctor dubiously and laughs in reaction. "The surprise inspection bit. Haven't seen that one done in a while. Only, the only person allowed to really look around back here is Gryf. She wouldn't fall for that one for a second."

But he still has a good-natured grin on his face. "You just showed up here, didn't you? It's all right, so did everyone else." He warmly extends a hand. "Shepherd Book."