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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Did you have a sniper on your team? If somebody stays too far back, either on top of the giant rocks or by the Kell ship thingy, the wave count will reset. Just make sure everybody is relatively close to the objective when you kill the last enemy of each wave. The same thing happened to me when I was doing the nightfall solo last week.