Soo, i recorded this video a couple of month ago. Thought they fixed it. People tell me it still works. Thanks Bungie....i guess.
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You don't even need to do this. There's a ledge when you first enter the area you can crouch on and not or barely get hit. Black Hammer let me solo the nightfall with two characters and finish Archon off in a minute or less. But the ledge works with any sniper.