![http://img691.imageshack.us/img691/7994/timeyp.jpg [http://img691.imageshack.us/img691/7994/timeyp.jpg]](http://img691.imageshack.us/img691/7994/timeyp.jpg)
This graph is meant to explain my point, and paraphrases a relevant portion of the plot, but does not explain the movie.
Basically there are 2 people, Person A and Person B. Person A goes through the red spot "later" back to 9AM. In the movie, Person B goes from the last black tick "1 hour after later" back to 8AM, the first black tick, and for lack of a better way of phrasing it "stops" person A (since they have a 1-hour head start on person A, who comes back to 9AM).
My problem is, wouldn't person A be able to stop person B from ever travelling back in time to before 9AM since person B can't travel back in time until awhile after person A leaves in the original timeline. Person A could have spent all of the time in between the middle red ticks (9AM to "Later") PLUS the final 1 hour ("1 hour after Later") to stop person B from ever traveling back in time.
But on the other hand, assuming person B DID get back in time to 8AM (he somehow has priority over changing the timeline), he could stop person A (who went back in time to 9AM) from stopping his previous time-self(previous-time person B) from going back in time and Person B could inherently control what happens in the timeline from that point.
OR...due to fate or whatever, maybe person A just didn't realize that person B was going back in time and forgot or neglected to stop him from going back in time to 8AM.
It's mind boggling and confusing. Deciding who has first-right to alter the timeline is a kenundrum, I think person A has the right since he traveled back in time first. It's not depicted this way in the movie, but I think this might technically be because person A didn't know what person B was up to, I don't remember exactly, or it might not have been clearly depicted.
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