Professor McGonagall: Nothing, I repeat, nothing gives a student the right to walk about the school at night. Therefore, as punishment for your actions, 50 points will be taken.
Harry: 50?
[Ron and Hermione also looking shocked, Draco smirking]
Professor McGonagall: Each.
[Harry's mouth drops open]
Professor McGonagall: And to ensure it doesn't happen again, all four of you will receive detention.
Draco Malfoy: [smirk suddenly fades and steps up] Excuse me, professor, perhaps I heard you wrong. I thought you said the four of us.
Professor McGonagall: No, you heard me correctly, Mr. Malfoy. You see, honorable as your intentions were, you too were out of bed after hours. You will join your classmates in detention.