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nebularian wrote:
Of course, if Biff did come back to the alternate time, there would be no time machine (because the changes he made ensured Doc never got the chance to make it). So, that would have left an irreconcilable paradox.
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Well this is kind of explained in the BTTF2 as well. When they leave Jen and Ein in 1985-A (or Hell Valley, take your pick), Doc said that once they fixed the timeline, the present would reform around them.
Changes in time are not instant in the mythos. So when old Biff gets back, it's still the 'old' present, maybe. As none of the characters are in a position at that moment in time to tell otherwise.
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Given the model of BTTF2, the paradox would be avoided because you can't affect your actual past. Rather, you only create additional alternate pasts.
But then again, the model in BTTF1 is different: Marty would not have disappeared unless he were altering his own past.
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It does make more since if you assume that the 'other timeline' was more of an example to explain it to Marty (and there for us). All other evidence points to a single timeline.
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Hmmm... well... it was indeed a good movie even if it is a bit confusing.
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Very true, and I have far to many explanations for all of the confusing bits then is probably healthy.
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When Old Biff returns to the future (2015?) in BTTF2, he seems to be having a heart attack. One of my friends offers that he might actually be "fading" out of existence. (Marty has similar symptoms in BTTF1 when his existence is threatened.)
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Spot on with that. There's actually a cut sequence that shows him fading out. Hopefully it will be on the DVD this December.
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Above, Grapes proposed that it might take some time for changes to propogate through the timeline. Perhaps Old Biff was fading away, and Marty and Doc made it out of the future before they faded as well.
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This does seem be the best answer in the end.
--Fox Cutter
http://www.chaos-keep.com/