Arthur watches all this happen in silent interest, and he's impressed when Boxer walks away without any argument whatsoever. But that means they're alone now and he has to face the fact that he came over here probably just to have sex. It's not like he has anything to talk about other than a laundry list of politics Eames probably doesn't want to provide any information on, so as soon as Boxer's gone Arthur raises an eyebrow at Eames, wondering if they're going to bother with any more small talk.