He smiles at Lucius, because who doesn't appreciate a glowing testimonial.
"I'm a former army surgeon, in fact, though I've been in general practice for a few years now. Useful skills, in a place like this."

Watson gives Izzy a penetrating look for a moment, because this man seems about as friendly as a wet cat, which is just about the opposite of the rest of the crew that he's met. And time is weird, but we're going to assume that this takes place after Ed waved a knife in his face. Still, he shrugs it off and glances away, carefully casual. "And the facilities here are first rate, at least by my standards. Have... have we told him about the different times yet?" He glances at Lucius.