Originally Posted by Agent Proto
That only applies to backward time travel (though it appears consistently based solely on those events). in BTTF 2 they go to the future and despite Marty not (yet) traveling back to the past to live out his life, his life was lived for him as if he came back to the present - yet the change that he subsequently made (not drag racing) hadn't happened in this timeline but happened in the subsequent narrative.
So what happened to the timeline that taught him to not drag race?
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