Matt says that his grandmother said to watch out for the Murdock boys, they had the devil in them. Which is kind of a crazy thing to say, because she must have died before Jack, or Matt wouldn't have gone to an orphanage. And since Jack didn't have any canonical siblings, she was saying that not only about her boxer of a son but her adorable, non-violent, disabled grandson.

Which is weird. Anyone want to explain this in fic?