I think the whole point of the episode might be that if you don’t create a new world line the universe will just fix itself in other ways, to prevent the paradox. The paradox not being that Mayuri didn’t die, but that Okabe went back. Okabe needs to realize he’s in a paradox: if he saves Mayuri he won’t have a reason to go back and save her so Mayuri will die, which now means he would go back to save her… (going by the show’s logic the world lines themselvs are immutable)
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