Detective Kemper wrote:
And Strauss gets the brain of the wolf man "so that all your waking hours will be spent in untold agony while you wait for the full of the moon that will change you into a werewolf..." And that threat still makes no bloody sense.
Sure doesn't. But maybe either:

A.) Niemann was just trying to scare the sh%t out of Ullman

B.) Niemann is so crazy that he actually thinks this would work