Man can ... come from a different planet, fly, have super strength, move incredibly fast, be invulnerable, have laser eyes and ice breath? Yes.
Man can ... travel back in time? No.
I can be nitpicky with movies, but method of time travel is generally not one of them. Since no one has done it before and the actual possibility of it is very debatable, I'm cool to let people come up with creative ways to make it happen. I do find this scene quite stupid, but moreso because of the huge cheese factor than the actual turning back of time. In the context, it's probably oko to let it slide.
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