Sirius Black: Enough talk, Remus! Come on, let's kill him!

Remus Lupin: Wait!

Sirius Black: I did my waiting! Twelve years of it! In Azkaban!

Remus Lupin: Very well. Kill him. But wait one more minute. Harry has the right to know why.

Harry Potter: I know why. You betrayed my parents. You're the reason they're dead!

Remus 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!