Quote from : Harry Potter and the Prisoner of Azkaban Movie

Harry: There's Pettigrew.
Hermione: Harry, you can't!
Harry: Hermione, that's the man who betrayed my parents! You don't expect me to just sit here!
Hermione: Yes, 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've meddled with time. We can't be seen.