Siebren looks down at the surface of the water. "You're a doctor. Perhaps you will understand. I suffered a traumatic brain injury, years ago. One that I struggle with the results of, still. Confusion and...sometimes worse than that. It is hard for me, with people. And harder still, because in my world, I was...isolated. Kept, for my own good. Alone. For years. I was dangerous. It was what they said was for the best. I might still be dangerous."