Is anyone else having a problem with the Winter's Run Strike on Nightfall? I was trying to solo it and defeated the vex and fallen before the door that Ghost has to unlock. So I summoned him by the door, he got to work, and I ran up to the peak that's great for sniping, and killed all the vex. Then... Ghost started over, saying he had to breach the door again. I tried all this again, and the same thing happened. Is anyone else having this problem?