Sure enough, it is too difficult to explain the rationality of time-travel in a single universe. Unlike my initial thoughts, it is neither about the paradox of destiny nor about parallel universes, but about actually changing the past in a single universe. According to the idea of the film, it should be to change a point in the past and create a new history. The original history disappears, but the traces of the original history are preserved in the new history, so this idea makes no sense. Then I think the reasonable explanation is that this can only be a single straight line of cosmic space-time, going back to the past, under the condition of avoiding the paradox of destiny, it has truly disturbed the past and produced a new history. And the revelation from the future, such as blood clothes, telephones, ambulances, etc. that should not have appeared in the history shown in this film, can only show that Doug is not just traveling back to the past once, but has experienced several times. Tried to get the final success. It can be understood by the theory of parallel universes, each time crossing produces a new history, that is, a new universe, and the overlapping of these universes constitutes a story in this single universe. This explanation may be reasonable, but there are still some details that are difficult to explain. If this story is really serious, I am afraid it will take a few readings to understand it. Of course, even if you swerve around the paradox of destiny and parallel universes, it is still difficult to escape the shackles of the grandfather paradox.
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