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A Window of Opportunity
About halfway through the Maw, you need to traverse through maintenance corridors, you will emerge into a battle between the Covenant, Flood, and the Monitor’s drones. When you see the door out, go right to find a blood-stained health pack, go left and you will come to another door leading into a section closed off by blast-doors with ammo and a bunch of fiery rubble.
Once inside the room, you can shoot through the would-be bullet proof windows in the blast-door with any human weapon except the rocket. This is a great way to get rid of the Covenant and drones because the AI isn’t supposed to realize that they can shoot back. The flood never stop coming at this part, so don’t waste your ammo.