My husband and I were doing Seraph's Shield on Legend. We got all the way to where you defeat Haroktha, after the double Ogre room at the end of the outside jump puzzle. He had died at the end of the fight and when he respawned, he ended up at the end of the hallway by the door right after the brig fight, where you go to "surrender." He walked back up to the brig room, which teleported me to him. We had to do the fight over, but the fight allowed us to rez ourselves an infinite number of times. After the fight, we ran down the hallway, but the door was still locked. We ran back to the brig room, and the fight had once again reset. We had to abandon the mission altogether. I know some people had to re-do the fight when running solo, but it seems like they could progress once they did so. The mission wanted us to get the key to the warmind room, but there was no way to progress once we both got teleported back to the brig room.