Remus embarks on his mission to Hogsmeade, where his werewolf instincts draw him irresistibly toward the Forbidden Forest. Despite his friends' attempts to stop him, he uses magic to prevent them from following and ventures alone into the woods. There he encounters a dryad who has captured Castor, another werewolf sent by Greyback. The confrontation reveals Greyback's plans for a massive hunt on the next full moon, and Remus barely escapes after successfully casting his first Patronus - a wolf.