Originally Posted by Michael J Fox is Canadian
Which time are you talking about Marty fadint? In part I he fades because he critical junction point for his conception (the dance kiss) is in jeopardy. In episode 1/2 he starts fading at the same point his grandfather is killed. Both those times he is avoiding his own birth. He is clearly still born in the FCB timeline.
Marty doesn't just fade in the movie and episode 1 and 2 because he ceased to exist. It was also because his time travel didn't exist. It should be the same circumstances with Marty as it was for Doc. He couldn't time travel in this timeline so he should be replaced by FCB Marty like Doc was replaced by FCB Doc.
Originally Posted by sn939
Marty's fading in Episode 2 didn't really make much sense as per the established rules in BTTF1 either.
Marty apparently starts fading AFTER his grandfather was beaten to death. Later, even when he travels back earlier in the day, to a time BEFORE his grandfather was in any perceivable danger, he continues to have fading 'spasms' which get progressively worse. But that really doesn't make sense.
As per the rules in BTTF1, the moment Arthur McFly died, Marty would simply fade from existence. Period. There is no way Marty can continue to exist in a time period where Arthur McFly is dead, because the probability of his existence if 0.
Also, when Marty goes back to a time BEFORE Arthur McFly was killed, he should be fine. Or at any rate, the fading shouldn't be AS bad, because there is now a probability that Marty could exist.
Maybe because he already experience the point after his Grandpa died even though he went back a few minutes later?