Professer Lupin Teaches Ron andHermione how to do ridikulus, the only spell to repell Bogarts. He teaches Harry how to do Expecto Pratronem as well. During that level, Lupin has a special ability, Werewolf, wich alows him to dig. This is funny, as he only has a wolf head. Lupin also already knows every spell that You can have, not counting jinxes.