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In episode 345 of Naruto Shippuden (オレは地獄に居る/I'm in hell), when Obito arrives on the battle field, he sees how Kakashi killed Rin. The wiki summarizes this scene as

On his way to the battle site, Obito has a vision of Rin through his empty eye-socket. He arrives just in time to see Kakashi run his Chidori through Rin's chest. Rin's death awakens both their Mangekyō Sharingan.

In the next scene we see that the Kiri-nin are clearly disappointed by the fact that Kakashi killed Rin, one of them says "Damn it! He did it!", and another replies "After all the trouble we went through to get her!"

But I don't understand why he had to kill her, why they couldn't wait, e.g., for reinforcements to arrive. Is there some good reason why it was better, for her, or for the village, that she dies, rather than to be captured by the Kiri-nin?

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    This is answered in the manga and will be answered in the future in the anime, are you sure you want an answer? – Madara Uchiha Jan 26 '14 at 9:50
  • Yes, I wouldn't mind knowing now... – UwF Jan 26 '14 at 9:54
  • Posted an answer :) – Madara Uchiha Jan 26 '14 at 9:54
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    Because he is stupid. There was 3 seal master in Konoha at the time (Minato, Jiraiya, Kushina) that can fix the seal on her. – Tanya von Degurechaff Apr 7 '16 at 8:13
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When they were on a mission in the Hidden Mist, the Hidden Mist ninja captured Rin and made her into the 3 tails' Jinchuuriki. Their purpose was for Rin to return to the village, where they'll undo the seal, kill Rin and have the 3 tails rampage on the Hidden Leaf.

Knowing that, Rin jumped in front of Kakashi's Chidori as he charged on a hidden Mist ninja to kill herself and foil their plans.

Obito came a second too late and only saw Rin getting impaled, but later on he too learned the whole story.

The Hidden Mist shinobi were manipulated by Madara. He was the one who set that plan up then told Obito so it could have awaken his power. Rin had a curse on her heart placed by Madara.

Source: Naruto Manga - Chapter 675.

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    Thanks, I had difficulties understanding this, because it is not "Konoha-style" to sacrifice others. Now it makes sense, self-sacrifice is more "Konoha-style". – UwF Jan 26 '14 at 9:59
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    She should just whooped the mist ninjas ass's with the 3 tails... – Hashirama Senju Mar 9 '14 at 0:32
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    @HashiramaSenju: But she couldn't control it – Madara Uchiha Mar 9 '14 at 10:25
  • What was the curse placed on Rin's heart? – aug Sep 8 '18 at 19:32

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