But there is a problem, since he has endured so much pain, how can he fall on himself when he travels back. How could such a choice be made.
This question is also raised in the film, which came first, the chicken or the egg? That's how he has no origin, he is his own origin. This is a problem.
Another problem is that there are multiple selves in the same time and space. This is an old paradox. What would happen if the future you killed the present you, etc.
ps: When John first appeared in a bar, I thought he was like a woman, he looked and acted like a woman, but he turned out to be a woman!
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