[seeing Hagrid giving Pettigrew (in the form of Scabbers) to Ron; darkly]

That's Pettigrew.

Harry, you can't.

Hermione, that's the man who betrayed my parents. You don't expect me to just sit here.

Yes, and you must! Harry, you're in Hagrid's Hut now. If you just go bursting in, you'll think you've gone mad. Awful things happen to wizards who meddle with time, Harry. We can't be seen.