the real question is, assuming this guy is what he says he is (lets just go with it) how the fuck would he come back to the future (his time) if the "machine" that helped him travel through time is not with him at all times? So, realistically, he'd be stuck in the year he went back to.
This isn't like Bill and Ted's phone booth or Back to the future's car. Ya, those are just movies, but wherever they went the "machine" that brought them there was there with them.
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