It's hinted that the precursors allowed the forerunners to defeat them.
English
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Where at? I've read all the books and played all the games and haven't heard that hinted.
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I think the gravemind was the one who said something about it. It's mainly something people drone on the forums so I've never bothered looking into it.
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Oooooh! I know what you're talking about. The gravemind said that while the humans and forerunners were fighting, the flood retreated and let the humans think they had a cure.