Found another bug that happens once the Prometheans show up. Basically what happens is when you shoot at a watcher it retreats somewhere else except in this map they fly outside of the map and duck down behind the cliffs. Two of them did this before flying back into the map but a third one dropped all the way down and got stuck underneath.
I doubt it can be fixed right away but it’s something that needs to be addressed since you can’t complete the mission until all enemies are dead. 343 Either set up killzones that take out AI when they go out of bounds or tell your environment artists to stop setting so much stuff to render only (blatant reference to the Complex and Haven glitches.)