Scroll it slowly, otherwise you'll get lost. Imagine wandering in a birch forest; I bet you wouldn't run around like a headless animal. If you did, you could fall down and hurt your head really badly, though you wouldn't have it. But headless creatures don't have brains to speculate such matters, nor time to think about it since they're in a huge rush.
There's a very complex plot hidden in the shadows of the birches. Not every Harry Potter would get it.