Redditoramanwhodrinksrecently laid out his observation in the r / FanTheories subreddit . fit in to him , Doc ’s conclusion to heed Marty ’s monition from 1955 and take steps to save his own life in the present is n’t the sharp fibre change it seems to be .

In the yesteryear , Doc worries about how time travel might affect the future , and he reject to hear what the future has in store for him out of concern he might disrupt the space - time continuum . In the present tense , Marty finds that Doc finish up listening to him after all . When he demand what made him shift his intellect , Doc responds , " I cipher , what the blaze . "

The Reddit post argues that we see the exact here and now when Doc has his change of gist . When Doc is gear up theDeLoreanfor time travel , Marty explains how his dad won over his mamma by stand up up to Biff , something he ’s never seen his don do before . Doc responds , “ Never ? ” while looking at the restored picture of Marty and his siblings . Marty says , “ Yeah , why ? ” and Doc enjoin “ Nothing , ” before returning to the task in front of him .

Universal Pictures Home Entertainment

On first viewing , this exchange may not seem crucial enough to justify a pause in the action so close to the climax of thefilm , but accord amanwhodrinks , it ’s there for a good reason : “ My possibility is that Doc had a major epiphany in this scenery . At that moment , when he saw the restored picture of Marty and his brother and sister , he realize that you could totally deepen the past and still have a positively charged and congruent result on the future without destroying the quad - time continuum . ” If this speculation is accurate , Doc ’s conclusion to regulate his own fate at the end of the film is part of a developed character spark , rather than a snap decision made just for the nether region of it .

[ h / tExpress ]