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In "Harry Potter and the Prisoner of Azkaban" Harry and Hermione saved two lives (Sirius and Buckbeak). And in "The Order of Phoenix" Sirius died by Harry's fault. Why didn't Harry use The Time-Turner in that time to take him back again?

Rand al'Thor
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Steve
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3 Answers3

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There are a couple of reasons:

He wasn't thinking

His fist action after Sirius's death was to try to kill Bellatrix; he wasn't logically thinking at that moment. He wouldn't have thought about using Time-Turners.

Sirius would resist.

If Harry appeared randomly and tried to save Sirius, he would be suspicious of some kind of Dark Magic. Or, if he didn't get suspicious, he would turn the tables and try to protect Harry, at which point nothing would be different.

He didn't have a Time-Turner

Hermione gave hers back at the end of 3. Yes, there were Time Turners in the Department of Mysteries, but:

...while the glass cabinet that Harry now suspected had contained Time-Turners continued to fall...


“Ar, I always knew yeh’d find it hard ter squeeze me inter yer timetables,” he said gruffly, pouring them more tea. “Even if yeh applied fer Time-Turners —”

“We couldn’t have done,” said Hermione. “We smashed the entire stock of Ministry Time-Turners when we were there last summer. It was in the Daily Prophet.”

Even if he had thought of it, he couldn't have. Even if he could have, it's unlikely that it would have worked.

CHEESE
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    The best answer is "they destroyed all the time tuners moments before" which you included in yours so +1 – Himarm Apr 02 '17 at 16:38
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    Id personally stick that in bold at the front of your answer TLDR :p – Himarm Apr 02 '17 at 16:39
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    In addition; it already had happened - they (Harry) had watched it happen! The timetraveller can't change the past using a timeturner. They could save Buckbeak because they only thought they'd witnessed his execution - while they in fact had only seen the execution of Hagrid's pumpkins. Of course, if they hadn't traveled back, it would've been Buckbeaks neck and not the pumpknis - but for Harry, Hermione and Ron, it would've looked exactly the same. It was ambiguous. But Sirius did fall through the veil - everybody saw it. – Baard Kopperud Apr 02 '17 at 18:22
  • @BaardKopperud: Hermione and the Cursed Child play disagree with you. It is possible to change the past with a time-turner in Harry Potter; time travel is not logical, but treated in the same inconsistent way as it is in many other franchises. But changing the past is said and shown to be very dangerous. – wyvern Apr 02 '17 at 18:35
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    @sumelic It's generally a good thing if you disagree with the cursed child. – CHEESE Apr 02 '17 at 18:38
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    @sumelic Hush, I'm pretending that never happen! Now you've just ruined my chance to go back in time and prevent that play from ever happening... – Baard Kopperud Apr 02 '17 at 18:55
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In PoA, it was possible to save him without altering established events.

Harry and Hermione hadn't seen Sirius die in HP and the Prisoner of Azkaban. They knew he was imprisoned, but he wasn't dead yet; the only reason they needed to go back in time in order to save him was so that they could set everything up to give themselves that possibility.

They hadn't seen Buckbeak die either. They thought they'd heard the executioner killing him, but as they discovered 'later', it was actually something else they'd heard. So even Buckbeak, whom they really did have to go back in time for, could be saved without changing anything they'd seen.

In OotP, saving Sirius would have caused a time paradox.

Sirius died right in front of Harry. The only way of saving him using a Time-Turner would have been to go back in time and interfere with established events. Harry would have had to jump out of somewhere to change what he already knew had happened, right under his slightly younger self's nose. There would have been no way of doing it without causing a time paradox. As Hermione says in PoA, time paradoxes are something to be avoided at all costs when using Time-Turners.

Rand al'Thor
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    Isn't The Cursed Child filled with time paradoxes? – XYZ Apr 02 '17 at 15:21
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    @GoodDeeds I don't count The Cursed Child as canon. JKR didn't even play much of a role in writing it, from what I hear, and it contradicts established canon (the books) in various ways, most notably this very issue of time travel. – Rand al'Thor Apr 02 '17 at 15:25
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    @GoodDeeds Yes, yes it is. – CHEESE Apr 02 '17 at 15:29
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    I don't see why this matters--if Harry had a chance to maybe save Sirius, he would've taken it, no matter what time paradox it created. Either way, he did not have that chance, because there were no time turners. – CHEESE Apr 02 '17 at 17:58
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    @CHEESE The fact that there were no more Time-Turners is a circumstantial thing. As far as I remember, Harry never even considered the idea of saving Sirius with a Time-Turner; it wasn't a matter of "I can use a Time-Turner to save him! ... oh, damn, there are none left". This is, IMO, the more fundamental reason why he couldn't have done it in OotP even though he did something similar in PoA. – Rand al'Thor Apr 02 '17 at 18:10
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    @Randal'Thor I think that if he didn't think "I can use a time turner...oh wait," he definitely would not have thought "I could use a time turner to attempt to save my only family, but that would create a paradox and break the universe, so I guess I won't." – CHEESE Apr 02 '17 at 18:37
  • @CHEESE It was a fundamental part of Harry's paradigm that the past was irreversible, and that going back in time would just happen to work out to cause the exact events you already experienced - because when you first experienced them, future you was already there, involved exactly how you would be involved once you went back. He has a whole epiphany about this in Prisoner of Azkaban, though he words it poorly when trying to explain it to Hermione. You don't try things your understanding of the world fundamentally rules out as non-sensical, and for Harry, reversing time would've seemed so. – mtraceur Apr 03 '17 at 01:51
  • @mtraceur Yes but I'm saying that that definitely does not go through his mind after Sirius's death. – CHEESE Apr 03 '17 at 13:45
  • @CHEESE Okay, let's try this: When my mother died in my early 20s, I did not even consider the possibility of trying to revive her using psychic abilities (I strongly believed humans had them at the time). Why? I did not thoroughly consider how it was outside the scope of what I believed possible: the thought just didn't cross my mind. If I try to explain why the thought didn't cross my mind, I think it's because it was contrary to how I thought about the world - my thoughts don't go down those paths. Do you think it's possible that for Harry, using time travel to undo a death was like that? – mtraceur Apr 04 '17 at 10:49
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In the Harry Potter universe, time is a fixed entity - that is, you cannot create a paradox. There is only one timeline.

In Prisoner of Azkaban, Harry and Hermione were able to go back and save Sirius and Buckbeak because there was no paradox preventing them from doing so. Buckbeak never died, and Sirius was always going to escape - They didn't change the timeline because they'd already done it!

Remember once before Harry and Ron knew about the Time Turner, and Hermione was using it to get to class. She missed Charms one day, and the two of them found her sleeping in the common room. She couldn't just use the Time Turner to go back to Charms, because she'd already missed it!

The same goes with Sirius in Order of the Phoenix. Harry saw him die, so couldn't have gone back and prevented it. That would be a paradox.

And on top of that, let's not forget that the Ministry of Magic's entire supply of Time Turners was destroyed during the battle with the Death Eaters!

Cooper
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    "They have already done it." That's an out-of-universe explanation. In-universe their future selves are changing past events. As long as they keep doing the same thing it wouldn't cause a paradox. Rand al'Thor's answer is different, he says that they cannot change events knowingly from their own perspective. – Chris Apr 02 '17 at 16:57
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    First sentence is contradicted by what Hermione says in PoA and by the plot of Cursed Child. I would prefer for it to be true--it would be more consistent that way--but canonically it is false. – wyvern Apr 02 '17 at 18:37
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    @sumelic But characters aren't always objective sources of truth, right? They're relaying their understanding as characters, and we wouldn't expect Hermione to have a cutting-edge magical-science understanding of time travel, right? Or even the magical world as a whole? The impression I got from that book was that the magical world didn't fully understand time travel: it was complicated, poorly understood, and paradoxes weren't conclusively proven impossible, so they exercised due caution, undoubtedly warning the 13-year-old student very sternly about all conceivable dangers. – mtraceur Apr 03 '17 at 02:05
  • @mtraceur: Hermione might be mistaken, but she indicates that she's heard of actual incidents where people change the past, not just theoretical concerns. I can't check the book right now, but see this Vulture article "Wait, How Does Time Travel Work in Harry Potter?", which mentions a quote: “Professor McGonagall told me what awful things have happened when wizards have meddled with time … Loads of them ended up killing their past or future selves by mistake!” – wyvern Apr 03 '17 at 02:35
  • @mtraceur: Hermione is portrayed as a "know-it-all" character who generally has an accurate memory of facts her teachers tell her. And McGonagall is portrayed as a knowledgeable and principled character who would not be likely to be mistaken about thinking there were actual incidents where wizards had killed their past selves, or to lie about this to a student. There is also a Pottermore page that the Vulture article linked to that mentions the possibility of time magic causing present-day people to vanish and be "un-born." – wyvern Apr 03 '17 at 02:38
  • @sumelic Sure, Hermione is a proxy for author explanations of the universe a substantial amount of the time. But I wonder if perhaps McGonagall wouldn't've been incentivized to somewhat overstate the certainty that such events had happened. Still, I think you've convinced me that I might've given too much credence to the way the climactic time travel worked out, and Harry's own epiphany about his role in that particular event: given what you point out, it's entirely possible that paradoxes like killing your past self and "unborning" can co-exist with Harry's self-fulfilling-loop experience. – mtraceur Apr 03 '17 at 09:36
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    @sumelic I guess then the question becomes: which has a more memorable effect on Harry's paradigm and cognition about time travel? I'd suspect, to some degree, Harry's own bias would be to think about time travel in the terms he experienced, which was the self-fulfilling-time-travel-loop variety, a "me going back in time fulfilled exactly what I initially experienced anyway" understanding is what I'd expect would be burned into Harry's mind after that, with the mention of paradoxical events suggesting time-malleability being something he may have forgotten as I did. – mtraceur Apr 03 '17 at 09:44