[ The exploding light makes him jump, and combined with the juddering pace of the carriage Karkat is starting to feel Less Than Safe standing on the seat like he is. He gets down with his hands raised, appeasing whatever deity it was that made the bulb go boom because he is not experienced enough to even consider connecting it's dramatic death with the dead girl in front of him.

She said his name and now there's literally no denying it. He's half way to some emotionally befuddled reunion when she speaks up again, and he's momentarily stunned by the question. ]

Knew wh- [ Shit. ] I- [ Shit shit shit. Either he has to fess up or come up with some logical reason for a) being able to see her, and b) explaining why he knew her spirit was still hanging around her old haunts. Shiiiiiiiiit. ] I.. knew I wasn't alone in this carriage. [ Good save. It doesn't explain why he's so calm about talking to a ghost, but good attempt, Karkat. ] I kept feeling like someone was watching me, and I was just about to blow the whistle on whatever homeless scrap was about to make this tube line into a major meat train fiasco, but. It's you.

[ Yep. It's Aradia. His dead friend. That sure is A Thing. Karkat stares for a minute, then swallows. ] You're a, uh.. Ghost, right? Either I've been spiked and I'm freaking out half way back to some lunatic's digs so he can do with me as he will, or you're a ghost.