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Benja comments on Causal Universes - Less Wrong
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(There's also a prophecy. True, a prophecy could simply indicate a Meddling Force that nudges events in a particular direction, rather than someone receiving information from the future, but once you have one obviously-causality-violating thing, there's much less call to be extremely suspicious of other, apparently-causality-violating things.)
Rowling is on record as stating that prophecies can be just-walked-away-from which makes their dynamics less clear and not obviously a self-consistency thing.
What does this even mean?
I think it means that prophecies may be merely "very good magically-derived estimations of the future" -- we are not sure they bind the past with the future as tightly as Time-Turners seem to do.
Oh, I didn't know that, thanks.