On Truth and Reconciliation when in the room to save Keyes, my friend and I have been stuck for an hour now because we spawn in, and when we kill the invisible elites that come in, about 50% of the time the Marines and Keyes turn on us and kill us. We cannot get past this. It is continually happening that they turn red on reticle and radar and shoot us.
That only happens if you betray two or more marines. If you’re chucking grenades at the door the Elites come through, try slowing it down a bit. There are two marines surrounding the door (might be more than that) and a poorly placed grenade is going to kill them.