I was playing with a Friend, we where just about to start fighting the Boss. Before I could activate my Ultimate my Game Crashed, Now I cant rejoin them and thy are Fighting the Boss with 2 people Because Its a Nightfall. This Happend to be Before with a Normal Strike, But I thought it was fixed. Last strike I could fight the Boss where the Nightfall now is. I do not know how to Fix this, or if its something that Bungie need to see in my game files. Hope this wont happen again or to anyone else.