She knew that Snape had known about Draco’s task just like the other Death Eaters, but he had offered his help. Maybe he had been sincere. Maybe that was why he had killed Dumbledore; to make sure the task was fulfilled, to make sure Draco would stay alive. After all, he was his godfather. But that wouldn’t explain on which side he was. He could still be a loyal follower of Voldemort with compassion for his godson. But why didn’t he drag Harry with him when he had the opportunity to? He could have killed the headmaster and then present her friend as a present for Voldemort.