In Back to the Future, to get Marty back to 1985, it looks to me like the Doc connects a cable to the pole with the weather vane on top of the clock tower and fastens the other end to a light pole on the other side of the road. They need the power of the lightning to transport Marty to the future.
They know what time the lightning strikes, because the clock is stopped by the lightning and Marty has the pamphlet from the future with the time on.
Marty drives the DeLorean, the lightning strikes and goes along the cable. All goes according to plan and Marty is transported to the future.
Two questions:
- If the lightning strikes the pole and travels along the cable to the ground, would not the clock be bypassed and therefore not be stopped?
- If so, would this not constitute a time paradox?
Answer
Doc Brown indirectly explained this in Back to the Future II, when he was explaining to Marty what Biff had done when he brought the Sports Almanac back to his younger self.
When the clock wasn't damaged by the lightning When Marty began to alter the past a new timeline was created wherein the clock continued to work all his changes took place. This was the timeline that Marty returned to when he went back to the future/present. He never returned to his actual original timeline, as seen at the start of the Back to the Future.
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