[quote=@Stabby]
<Snipped quote by Balance>

Neil: As far as I know there are no exceptions, so it's likely that the one you met has a side effect that's easier to hide. 
[/quote]

Hmm. Well, knowing what you know now about the world before its fall, do you think Twisteds should have logically resulted from the previous state? If they couldn't possibly exist in the world before the fall, then you have good reason to believe the fall is part of it.