I've reached the end of this mission 6 times now and have killed Nokris each time. After killing Nokris the game queues me to send out my ghost on a platform in the middle of the room, which should then bring out a crystal and begin a dialogue. The problem is, nothing ever happens after I send my ghost out, the ghost just disappears into thin air and I'm stuck waiting in an empty room. I've tried going back to orbit and redoing the mission, relaunching the game and doing the mission, and even waiting a day before doing the mission again, but no matter what I try the same glitch always happens at the end. Any help?!???????