[For a moment, it seems like something he's said has annoyed the stranger. He mistakenly guesses it might be because he's pulling the man's attention away from his book. He steels himself, ready for an argument... but it isn't that at all.]

Turbulent? [He takes a subtle glance around the train, trying to gauge how close the other passengers are and how interested they might be in listening in.] What do you mean by that?

[He opens his mouth, a question on his lips, when the man introduces himself. A snort of laughter that he can't quite stifle escapes before he can stop himself.] I'm sorry... Did you just say Alucard? [The guy was joking, right? Except... he really didn't look like he was joking.] Are you serious? What... were your parents super into vampires, or something? [It actually kind of fit. This guy's aesthetic screamed that he was a little too into vampires.]