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It is possible that she could mean this is how the world ends for her or the flood or something. We dont know for a fact that she is talking about this is how the world ends for humanity.... Just some thoughts
We don't know yet, wait for the game, what's the use of these theories anyhow? I'd say she meant humanity, because she said world *hint *hint. Plus the fact that it appears the Covenant were about to activate the Ark.