Remus Lupin Transforms into a Werewolf

PAGES: 380-381

As the group approaches the castle, a cloud moves, revealing the full moon. Remus Lupin, who forgot to take his Wolfsbane potion, begins transforming into a werewolf. Sirius Black immediately urges everyone to run, but Lupin breaks free of the manacle that binds him to Peter Pettigrew and Ron Weasley. Sirius transforms into his Animagus form and fights the werewolf, attempting to protect the others.