"Hey, common ground!" M'gann beams, watching him. And...How does he do that thing with his fingers? M'gann gives them a curious look, trying to figure out just how it works and what sort of significance it might have. Maybe it's one of those expressive things, or way of communicating something?

After a moment of puzzling it out, M'gann realizes she's staring. "O-oh, sorry. Don't mean to be rude or anything, but that's kind of neat, what you do with your hands." And she might, possibly be trying to mimic it as well, as unobtrusively as possible.