From afar it looks like the guy is smoking, puffs of smoke in the cold air. Not something that's really even noteworthy, but when there's not many people in the street he has an unconscious tendency to notice the inconsequential.

But maybe the smoke is a little less normal than he gave it credit for because when he steps close enough, there's no cigarette hanging from that mouth. A mouth that actually looks kind of familiar in an annoying way. But since he just met his own doppleganger, it's a less magical moment than it might have been.

"Hey, Puff. Did you swallow your cigarette?"