T.h. White said this quote

He did not himself believe in the supernatural, but the thing happened, and he proposed to tell it as simply as possible. It was stupid of him to say that it shook his faith in mundane affairs, for it was just as mundane as anything else. Indeed the really frightening part about it was the horribly tangible atmosphere in which it took place. None of the outlines wavered in the least. The creature would have been less remarkable if it had been less natural. It seemed to overcome the usual laws without being immune to them. (The Troll)