Little Jenna burns the doll, which coincides with the scene of the old Jenna being burned to death, which triggers the memory of the hero, but because the memory is not complete due to the crossing, the idea of returning to the 15-year-old to save the old Jenna was born, so the beginning of the film was born. The parallel world 2 - a world with old Jenna and no other relatives. There is a key point in this world. Little Jenna's mother, Elisabeth, did not die, and it was this key person who triggered countless crossings after SAM. More parallel worlds 2a, 2b, 2c are derived, but the following parallel worlds are all branches of Parallel World 2.
In fact, when the fire broke out, Sam had two choices. One was to save the old jenna first, and the other was to save his parents first. The randomness of his choice will determine the direction of the future world, that is, the final male protagonist of Parallel Worlds 1 and 2. Realizing this, did not save the old JENNA and returned to Parallel World 2. In order to ensure the existence of this parallel line for herself, Jenna must realize the link where her father killed the old JENNA, and the original and only way to achieve it is to let her father go to Parallel World 2 first, and she has experienced all kinds of killing the old man. Jenna, return to Parallel World 1, complete the loop. This is similar to the movie horror delta tanker, which is an endless loop.
Divide time into points, then our world is composed of points, and any two points can be connected into a line to form different spaces. Different people and things exist in different spaces. If you die at the point of 1:01 on December 12, 2012 and lose the memory of any line, you will be at the point of 1.:00 on December 12, 2012 It is the living that retains the memory of any time line, the living you have nothing to do with the dead you.
The characteristic of crossing people is that they can keep memories of more than two timelines, but for ordinary people, this is impossible, we can only keep memories of one timeline.
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