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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bungie by accident put an area block that u have to be in to be able to progress. i believe once you are past the small bridge and go up you are out of area. as long as one person is down there Rambo style the others can go snipe but if the ground Guardian dies he has to be revived before all enemies are killed or the whole fight resets and u have to do it all over again. as for crota just go back to orbit and back. that usually fixes it.