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I agree with the parallel universes theory. Technically, I believe the "self" that went back in time would be stuck there in one reality but the separate reality where he got his leg cut off would still be there.

This means that time travel is not technically time travel but instead universe hopping. A self from one universe travels to a second universe where an entirely different sequence of events is triggered. The original timeline continues without the time traveler and no other noticeable changes (except maybe a rip in the Time Space Continuum, who knows) while to other timeline goes on with the two selves, one old and missing a leg and one young with a leg. Where this goes from here depends on the actions of these "self"s

Thats the most logical theory I can come up with. Point out the error of my ways please