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But HOW?!
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The Activation Index. Why else would the Didact replace the Composer the UNSC took from Installation 03? It's because Halo (or at least Installation 03) was designed to be able to amplify the Composer's energies much as it can amplify the cross-phased supermassive neutrinos.
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Except isn't the Didact specifically stated to be [b]immune[/b] to the Composer?
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It was never said he was immune.
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In the Terminals, the Didact himself specifically says "[The Composer] will not work on my new form." Terminal 5.
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Right. Will not work =/= immune. Nothing was said about multiple composers, and Brian Reed said we would get an explanation.
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But how did the Composers activate, and especially given that he crashed [i]behind[/i] them.
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The picture you posted answers your own question.