I discovered this while soloing Nightfall. Didn't get a video at the time and didn't feel like redoing Nightfall for it. Works on all Difficulties. I've named it the "Pipe Trick". There is an Invisible wall on those Pipes but it doesn't go all the way to the roof. You can jump over it using Double jump, Triple Jump, warlock jetpack. Leave the one Legionare alive so you can practice it without having to deal with the boss and any adds that spawn. Once atop the pipes. If you're smart about it, you can solo Valrus. He is targetable nomatter where he is inside the room. I'm very happy I discovered this spot. Hope you all enjoy :D