After Biff gets his cane stuck in the DeLorean upon returning to 2015, he starts to thrash around in pain, apparently having a hard time from the exertion. Robert Zemeckis has stated that Biff was experiencing the same thing Marty did at the dance in the first movie: fading out of history. The idea was that, by going back in time to give the sports almanac to his younger self, Biff had somehow altered his own future so that he no longer existed in the year 2015. According to script drafts, Biff's wife (Marty's mother) had shot and killed the abusive Biff in 1996. A deleted scene in the DVD extras makes this much clearer as we actually see Biff vanish.

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