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Originally Posted by Zodiamaster
He's just going to make it look as if Kurisu is dead, that will trigger everything you've seen since episode 1.
The whole point of it is to retain all the memories of what happened in the other timelines.
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This is true.
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In the original timeline, there was no need for him to save Kurisu she doesn't actually die
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This isn't. Kurisu is destined to die in the Beta world line, if Okabe didn't intervene Kurisu's father would have killed her, but when he intervenes the Attractor Field made him kill Kurisu (as one possible outcome), hence why there is a need to create the Steins;Gate world line that is different to the Beta line, but to do that Okabe needed his memories and experience from the Alpha line as well as this "new" extra experience in Beta line to cause his future self to have all the understanding and skill needed to come up with the plan, that's why he can't just run in and save Kurisu, he must do so without altering *his own past* at the same time. One theory is that if he doesn't let the past self see Kurisu "dead", the moment he returns to his own time the world would be reconstructed into something entirely different, or that the current Okabe would vanish because there would be a cause and effect paradox, in essence he is actually abusing this same cause and effect paradox to force the world to construct a new world line. Preventing her death just happens to be what's needed to stop WW3 as well, so consider that as the bonus.