Lupin had just turned into a werwolf and Snape had pushed you, Harry, Ron and Hermione behind himself to protect you but lupin swings at Snape and you jump into from him, there are now four claw marks goring from your right eyebrow diagonally to your lips, and it’s bleeding. And for the first time you see Snape go even paler then he normally is and he looks horrified, he’s completely lost his cold detached demeanour