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What would happen when Harry and Hermione would meet other Harry and Hermione while using time travel clock? For example scene of execution of hippogriff in Prisoner of Azkaban.

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    I foresee two possibilities. One: coming face to face with themselves three hours older would put them into shock and they'd simply pass out. Or two, the encounter could create a time paradox, the result of which could cause a chain reaction that would unravel the very fabric of the space-time continuum and destroy the entire universe! Granted, that's worst-case scenario. The destruction might in fact be very localized, limited to merely our own galaxy. – user13267 Aug 31 '13 at 3:34
  • if i had the ability, i would have marked a bazillion +1s to your comment. – RicoRicochet May 20 '15 at 6:47
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I'd say that one of them (not time-traveling yet) would be pretty shocked. Even Hermione said it before they ran to save the hippogriff. Hermione would probably be okay, because she already knows that she might meet herself in the future.

Harry saw himself saving himself (yes, that's really ) and the only effect was a confused Harry, because he thought it's his killed dad.

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    But shouldn't the time-traveling one then KNOW FOR CERTAIN that they'll see themselves? Would they not then be better prepared the next time to either avoid themselves or explain to themselves better? EDIT: I HATE TIME TRAVEL. – Rob Oct 11 '11 at 14:49
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    @Rob: You must to note that Harry got the knowledge of time-traveling possibility just before they went to the past. Present Harry is prepared to see himself, but his past self would be shocked – genesis Oct 11 '11 at 15:04
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    @Rob: You didn't get this. When they get to the past, there are 2 Harry. One present and one past, each one has different, same looking body – genesis Oct 11 '11 at 15:06
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    No, I get it. I'm just saying that "past harry" turns into "future harry" and has knowledge that he'll see the new (old) "past harry" while he is "future harry". Time travel makes most sense if you've watched primer, because then you know it doesn't make any sense. – Rob Oct 11 '11 at 15:09
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    @Rob: When present one travels to the past, the present one just becomes the future one and that from the past becomes the present one – genesis Oct 11 '11 at 15:24
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You guys are, of course, missing the simple point that since future Harry has already LIVED through the past situation, he is armed with the knowledge that past Harry never ran into future Harry visiting (otherwise future Harry would have the memory of having run into someone who looked exactly like him). Everything that happens when they travel to the past is exactly what had ALREADY happened by the time they made the decision to go to the past in the first place. In other words, they couldn't screw anything up by 'accidentally' running into themselves, because if it had happened, they would already know about it.

The only reason Harry didn't have the memory of seeing himself from the future is because it was too far away for him to see the figure properly, and he assumed it was his father, until he went back in time, saw his past self across the lake and then realised that he was currently the figure past Harry thought was his father.

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Hermione does mention that time-travelling wizards have been injured or even killed by their confused previous selves. Understandable if you didn't know time-travel was possible and suddenly come across somebody posing as yourself in a world of magic and polyjuice potions (though, I'd think about stunning first and asking questions later)

Harry thought he was seeing his father in the night-dark forest, so while confused, didn't feel threatened (plus, he had enough trouble with the Dementors swooping in).

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Due to the fact that the non-traveling Hermione already knows about the watch, she would pull non-traveling Harry away and maybe explain the watch to him. It could become difficult when Harry rescues himself with the Patronus; because he knows he can do it he won't have such strong feelings as if he is in fear.

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In the books, Hermione addresses this in a little more detail than in the movie, but the movie does explain it a bit. Basically, there's no paradox preventing someone from visiting their past or future self, but...

if Harry were to burst in on the three people in Hagrid's hut, including his past self, his past self might think he'd gone mad, or that his future self was some trick or illusion, and Harry's future self might be attacked by any of the people in the hut. Even if his past self believed that his future self was really him, changing the course of time so radically might have unintended consequences. If Harry had killed Pettigrew alias Scabbers in the hut, then Scabbers wouldn't have run off toward the tree, and all the events that unfolded, including Harry learning that Sirius was innocent and thus wanting to go back in time to save him, would never have happened. By remaining unseen, they changed time in such a way as to preserve the basic timeline and thus all knowledge of the events, thus not removing the reason they would have gone back in time in the first place.

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