It's very rare that your teacher tries to kill you, but even rarer when they turn your murder into a hunt. Unfortunately for Lupin, it wasn't really his fault so he can't be blamed for his actions whilst under the influence of the full moon; but damn, he is one scary werewolf. In a very small amount of time, viewers see the effects of his transformation and how it affects everything about him; including his mind. It definitely creates a sense of intensity about this magical world and once again, shows just how forbidden that forest should be.
