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In "Harry Potter and The Prisoner of Azkaban", if Harry (who time travelled) was protecting himself and Sirius Black from the Dementors then why a bright magical reindeer like image is shown on the other side of the lake?

15

It was not a reindeer but a stag. Harry Potter's Patronus is a stag. Harry and Hermione travel back in time to when they were standing on the other side of the lake. Future-Harry sees that Dementors are sucking the souls of Harry and Sirius and casts the Patronus. This Patronus is in the form of a stag. Hence Past-Harry sees a stag on other side of the lake.

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    but after this scene,harry was shown on the other side of the lake and using his wand. Then how his patronus came to their rescue? – Deepak Jul 17 '15 at 9:52
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    and why the same stag was not there when harry came after time travelling? – Deepak Jul 17 '15 at 9:53
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    Because the stag for created by Harry after time travell. – Panther Jul 17 '15 at 9:55
  • Because he was standing right behind it or at the place where the stag is. In the movie they have not shown a stag when harry casts the patronous but in the book it is explained well. – captainsac Jul 17 '15 at 9:57
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    don't worry if it was confusing, because the movie didn't do a good job of explaining this at all. it's quite sad that one of the best and most important parts of the book (explaining who moony, wormtail, padfoot, and prongs are) didn't make it into the film. – ell Jul 17 '15 at 16:29
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It was Harry potter's Patronus. He creates the Patronus for protection from the Dementors.

After future Harry came from time travel, he realized during the process that he has to save himself, he created the Patronus to help it past form.

From chapter 21 in wikia

After two hours, following Lupin's transformation, Harry decides they need to head back to Hagrid's empty cabin so Lupin doesn't attack them. After spending some time in hiding, Harry leaves the cabin to check out the present situation and sees himself, Hermione, and Black fainting from Dementors. He realises that the silver stag he saw earlier across the lake was not cast by his dad and conjures a powerful Patronus that drives all the Dementors away. When it returns to him, he pets it and realises that it was the same patronus as "Prongs," his father.

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