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Originally Posted by Michael J Fox is Canadian
See your theory is kind of disputed by Marty seeing himself go back in time but mind you the events he will encounter in 1955 have already happened. I don't see why the fire trails shouldnt happen for a time travel into the past, just because they go back in time and the timeline changes, doesn't necissarily mean the time travel doesn't. Marty would still go to 1955 from 1985, Doc would ensure it to keep the timeline intact. You can argue whether any of the first 3 time travels we see on screen in part II happen given the fact that they undergo timelines where they may or may not happen (going to 2015, back to 1985, and back to 1955). Presumably the doc getting struck by lightning happens in all timelines in the movies from that point on. The same may or may not be true for Marty going to 1885.
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But when Marty sees himself go back, its not in the same timeline but in the new timeline.
Look at it this way.
In Twin Pines 1985, the moment Marty goes back in time, that timeline ceases to exist, along with everyone in it. It is replaced by Lone Pine 1985...now despite all the changes made in 1955, Lone Pine 1985 is by and large similar in many respects to Twin Pines 1985-so much so that the event of Marty's temporal displacement occurs identically in this timeline. However, LP Marty's trip to the past, while identical to TP Marty's, isn't the 'original' trip back to the past...it's merely a duplicate of the event which happened in the original timeline. LP Marty's going back in time doesn't serve to change the past...in fact, technically, all it does is rid the world of an extra Marty.
Okay, suppose someone who is immune to the ripple effect (say a time traveller from the future) is present at the mall, the moment TP Marty goes back in time, from his POV, he would see the mall sign change, and maybe he would suddenly notice another Marty materialising out of no where...and Doc would suddenly have been wearing a bulletproof vest "all along". So, the moment TP Marty goes back, the observer is shifted to the new timeline...however things are superficially at least, in many ways the same as the previous timeline. Thus the flare trails are there, because even in this timeline, Marty went back.
However, that shouldn't be the case with the Kid Tannen ruled timeline. In that timeline, if an observer were present, the moment Marty and Doc hit 88 miles per hour in the air, reality would have transformed around the observer, such that the aged Kid Tannen would simply vanish from existence, rather than be able to grit his teeth at the disappearing Delorean...in fact, the moment they go back, the Tannen ruled timeline should be transformed into the FCB timeline. The flare trails shouldn't even be there, because in the FCB timeline, Marty and Doc didn't make that trip back.