Cortana: The Lost Story

The Plan

I may have a chance at taking the flood out. Not a a large one but there is still a chance. It's risky because I could compromise the ship but it's better than letting the flood live.

"I am a monument to all your sins."
What. Was. That. A voice just echoed through the entire ship. Wait... I've heard that before. Yes that is the same voice I kept hearing on High Charity. No. No it can't be, he cannot have survived. The Gravemind, we killed him. How did he make it?
"Did you think me, defeated? I have beaten fleets of thousands, a machine will not be my end."
The voice shakes through the ship. "How did you get in here!" I yell at whatever is listening.

"Did you forget? We had a deal, I will ask and you will answer. So let us begin."
I can feel his presence in my system just like before. I don't know if I can handle it again.
"No. No. I WILL NOT PLAY YOUR GAME." I scream at him. I have to keep him distracted. I need to lure him far enough away to blast a hole in the ship and suck him right into space. The problem is i know the Gravemind, we have shared a mind before. I have to trick him, were it so easy.
"I see your machine isn't here to save you this time, I know you have a plan, we have shared a mind before... And perhaps we still do."
How could I have been so blind. Of course, we still share a mind, he can still hear me wherever I may be. This makes it tough, how am I going to complete the plan if he knows everything I am thinking. For once in my life I feel like I cannot do anything. I am supposed to always know what to do... But I don't, I just don't.
"We exist together, two corpses in one grave. Yet a part of you still remains, a part not even I can reach. What secrets are you hiding?"
That's it! Of course! The backup system the Unsc built all AI with to hide all our information. He can't get past the lock! If he can be restricted of that info I can remove him from my system... But how?
Wait I've got an idea... I can override my system to creating an explosion and destroy his part of the system. It would be powerful enough to remove him and I can get him out of my head. Once and for all.
"Were it so easy, you see we are one mind, one body. If you take me out, you take yourself out." His voice is almost like an earthquake, shaking everything.
That's exactly the plan Gravemind, I'm going to destroy myself, to destroy you.