I was doing the Nightfall yesterday with a group from LFG, one of those groups that had mics, but weren't talking. Went fine until we got to the bit where the ghost opens the door to omnigul's area, and one of the other 2 turns up on his sparrow and kills the other guy, and tries to kill me as well. I had blink on, so he couldn't get me, was tempted to not revive him later when he died, but just wasn't bothered, I think the guy was just bored, that's why he was trying to sparrow-kill the rest of his team, these strikes are a bit old at this stage.