We can't let the Monitor activate Halo. We have to stop him. We have to destroy Halo. According to my analysis of the available data, I believe the best course of action is somewhat... risky. An explosion of sufficient size will help destabilize the ring, and will cut through a number of primary systems; we need to trigger a detonation on a large scale, however. A star ship's fusion reactors going critical would do the job. I'm going to search what's left of the Covenant Battlenet, and see if I can locate the Pillar of Autumn's crash-site. If the ship's fusion reactors are still relatively intact, we can use them to destroy Halo.