"Eh, don't make 'em do that, I won't take long." He assures her, and on his way to refill his drink, he passes Billy and the timing is such that there's a totally awkward moment of eye contact, during which he realizes hey, that guy was looking at him. It's the guy he saw Remy with at the protest, even. Hmm. But John doesn't say anything to Billy at that time, and he is, as promised, very quick, because he doesn't even try getting through to the bar, he just (once he's somewhat out of sight) steals someone else's, which is a great way to get some kind of disease but that did not even make him hesitate.

On his way back, he nods casually at Billy, but sits next to Kate without any comment.