Very well. Kill him! But wait one more minute. Harry has the ri...
Professor Lupin: Very well. Kill him! But wait one more minute. Harry has the right to know why.
Harry: I know why! You betrayed my parents. You're the reason they're dead.
Professor Lupin: No, Harry, it wasn't him. Somebody did betray your parents, but it was somebody who, until quite recently, I believed to be dead.
Harry: Who was it then?
Sirius Black: Peter Pettigrew! And he's in this room, right now! Come out, come out, Peter! Come out, come out and play!