My buddies and I were running the nightfall as normal and while I was trying to show them where to hide if they took too much damage, Phogoth and every additional enemy completely despawned and we beat the nightfall and collected our loot without ever having to fight Phogoth. Pretty cool glitch. I haven't tested it again yet to see if it was a one time thing or not. We were chatting in party chat instead of fireteam chat, so unfortunately there are no voices but if this video gains popularity, I will do a voice over for it explaining exactly what happened.
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When i was doing Heroic on level 30 and one person died and we back where you were and it said the darkness consumed you.When we respawned Phogoth was gone with everything else and there was also the two holes like in video.