time travel - How is Harry able to cast the Patronus to save himself & Sirius?

When we read about the Dementor attack down by the lake in Prisoner of Azkaban, we experience the situation twice. The use of the time turner affects both as both Harry's are present in both situations, we just see it from two different perspectives, first being before the use of the time turner when he believes he sees his father but is actually himself after using of the time turner.

What I don't understand is - the first time the Dementor attack ever happened there could not have been the version of Harry after the use of the time turner to cast the patronus in the first place. The problem lies it the fact that in order to get to the situation where Harry is able to use the time turner he requires there to be a version of himself which has already used the time turner - so if the Harry that used the time turner hadn't saved them, he wouldn't have been able to get into that position.

Presumably the Dementors would have succeeded in kissing him the first time so he wouldn't have been in a state to be able to use the time turner. Even though that is a presumption of what would have happened, the original part still doesn't make sense.

Comments

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Both the elves and the dwarves were famous for their metal work in the Lord of the Rings trilogy, but what is the difference between what they made, and which one had the better skill of making amours and swords? Answer James Christopher's answer sums up the second part of your question well, but as to the difference in what they made, a little more detail is needed. Once the Elves learned to forge with steel, the shape of the sword changed, now being able to take on the form of a great broadsword or a light and agile curved sword. Additionally, they took great pride in decorating their swords. As we see in the Lord of the Rings , some swords like Sting had magical properties such as glowing blue when orcs are near. As far as the use of Mithril, lotr.wikia has two contradictory passages: Thus, Elven blades became renowned as great weapons, capable of performing deeds beyond the skill of their handlers and were even more glorious when the use of Mithril was allowed to the Elves. ...

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In the episode 'The Pointy End' (Season 1 Episode 8) when Arya runs from the Lannister guards you hear the sound of a sword being dropped (around 4:56): [embedded content] After that neither Syrio or Ser Meryn Trant is never mentioned or seen in the show again, except when Arya mentions to the Hound that Ser Meryn Trant killed Syrio. Is there any mention in the books that Syrio actually dies?

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