When I go into a dream, I usually pick up on a mood right away. When it's a good dream, I feel something pleasant. When it's a nightmare, not so much. Stiles' nightmare had me scared, so I can only imagine how he felt. There was a door and it was open. I went to close it, but I felt a compelling urge to go through it instead. That's when I saw a giant, imposing tree stump he told me was the Nemeton. It just went black from there. There wasn't much I could do. I got the feeling that the nightmare itself was more powerful than I was.