I'm the Derealize mission. I'm in the boss room and defeated Xir-Kuur but the mission will not progress to the next step. I've attempted damaging the enemy on the balcony above but it is immune. In addition to moving around the room to see if the event would trigger, I've attempted dying which was also unproductive but cost a revive token. I have the Sightless Mastery exotic Tower Order that I would like to complete but I don't want to go back to orbit and lose mission progress. I have limited play time and don't want to waste that time by repeating the mission or attempting a different mission just to complete the Tower Order.