Karkat hasn't a clue what she means by the honor student remark, and has had enough nonsense already that he doesn't go to ask. No, when he turns around, it's not for that. But turn he does, and it's with a face gone pale and ashy.

"Excuse me? What do you want to know my blood for?"

He wonders, are there other trolls here? Have they gone talking about it? What if demons have their own hemocaste system? It took him years to settle down about it among his friends when none of them cared anymore, and it's far too easy to fall back into the old fear.