It almost seems like the whole show has actually been John-117s retelling of events to the AI.
Presumably, thats the result of a few battles with the Covenant on the ring.
Its awake because you are here.
You are here because it is awake.
Its been down there all this time, waiting to meet you in the dark.
And its Guilty Sparks job to ensure that happens when necessary.
This is where Master Chief comes in, with the Monitor manipulating the Spartan into almost firing the weapon.
Cortana shows up just in time to stop the fatal error.
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