"Listen to me." Severus is calm, even a little comforting - more like stabilizing, but it's as close as he can get. "Werewolves are monsters. It doesn't mean he's a monster when he isn't changed. It's just as you said. He wasn't your friend anymore. This is why people who deal with werewolves have to be trained to do so. It wasn't fair of him to ask you to put yourself in that position. You did the right thing. You got away."