SPOILER--after seeing the movie a few times the little things make sense

Rating: Null/10 (23 June 2004)

In the scene where Professor Lupin is instructing the students on repelling the Bogget (shape shifter), its Harry Potter's turn to cast the ridiculous spell. The Bogget's power lies in the ability to assume the shape of the most feared object of the person's mind. Since Harry's fear is the Dementor, the Bogget changed into a Dementor. Harry is scared and can't throw the ridiculous spell, so prof Lupin stands in front of Harry. In doing so, he is now the focus of the Bogget and the fear that the professor is keeping deep inside is transformed by the Bogget. The fear? A full moon. Why? Because Professor Lupin is a Werewolf. You see this full moon picture again in the last part of the movie when the Professor, Harry, Sirus Black and crew are together at night on the hill. The full moon shines through the clouds and the Professor does his wolf thing.