Flushed with his success, Harry hung around to watch Ron and Hermione. Ron did very well until he reached the Hinkypunk, which successfully confused him into sinking waist-high into the quagmire. Hermione did everything perfectly until she reached the trunk with the Boggart in it. After about a minute inside it, she burst out again, screaming.
Harry and Hermione dashed across to him.
¡°Yeah, that's right,¡± said Harry offhandedly.
¡°Harry,¡± said Lupin hurriedly, ¡°don't you see? All this time we've thought Sirius betrayed your parents, and Peter tracked him down ¡ª but it was the other way around, don't you see? Peter betrayed your mother and father ¡ª Sirius tracked Peter down ¡ª¡±