His teeth didn't get into that state via magic, dude, there's not actually a popular aesthetic trend for that. Adolescent smoking helped - but he finishes and crushes out the cigarette when Lucius approaches; while his body language says he's more or less fine, there's a definite hesitant edge to it, and he flicks the remains of his coffin nail into the gutter for lack of a proper bin, expression wry and guarded.

"Lucius."

... He's the age Severus expects him to be - remembers him as. For a brief moment he feels like a traitor, not having come to this one first. He reminds himself, not for the first time, that there's no way this one is from his world any more than the other one, and so it doesn't matter. Severus is alone, here as he is at home, and it's not safe to forget that - even contemplate it.

Still, there's an awkward pause, and he gestures briefly, impotently.

"My apologies for the scare."

Well it isn't a greeting, but it'll do.