interrelate : Back To The hereafter : Every delete Scene ( & Why They Were Cut )
The theory ( viaReddit ) focus on the scene where Marty is trying to get the variation almanac back from Biff ’s railcar . Biff is driving down a burrow as Marty chases him on his hoverboard , fighting for the farmer’s calendar . Thetheory questions Doc ’s timing in degenerate the string of flag and how he could peradventure know Marty would need bring up away at that exact time and in that exact localisation , especially as Biff is originally driving to exit on the other side of the burrow . The theorist believes that Biff originally catch up with up with Marty and runs him down , causing his death . Because of this , Doc saves his friend Martyby going back in time , and this is how he screw when and where to drop the flags . accord to the theory , Doc does n’t say Marty any of this as he has already shown himself to be emotionally fragile , and Doc would n’t want him to have to sell with his own expiry .
The hypothesis is plausible , as Doc and Marty have changed the timeline multiple time by that gunpoint , so it would n’t be all unbelievable that Doc does it again with no repercussions . However , Doc going back in fourth dimension again would mean that there are three Doc Browns in 1955 , two of them specifically following Marty and Biff ’s car down the tunnel , andboth in a flying DeLorean turned sentence motorcar . As Doc tells Marty , meeting your other ego can have disastrous consequences , and it would be impossible for Doc to save Marty without the other Doc seeing him .
Also , Doc gets Marty to Biff ’s car on the hoverboard before flying above them and following the chase . When Biff turns around at the terminal of the tunnel , he has already amount out the other side , so Doc would ’ve well see him turn around . Biff wait a while , revving his engine to dog Marty , and this give Doc plenty of sentence to realise Marty is being chased , allowing him to get to the other side to rescue him . He assure Marty that he has a plan , so there is no doubt that Doc is following them closely . Therefore , he could pull off the rescue withoutDoc breaking time change of location rules .
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