We are stuck after 3rd wave on Nightfall. There are no more enemies and the door wont open :/ What's going on?
Also, last night in Crota, on the 3rd sword with the last swing, Crota wouldn't die, we tried it 10 times, he just would not die. I had a lot of friends say the same thing happened to them.
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Go down and kill the last enemy, then go back up. That should let you get past that part.