There's another clip floating around of him doing the same glitch at the dogs so it's safe to assume that they did it throughout the whole raid ¯\_(ツ)_/¯
Coil glitching is when you switch to the Wardclif Coil, pick up one block of heavy, switch to a different heavy and you'll have max ammo for the one you just equipped.
Cozmo's Official Response: "We have seen the reports that an ammo exploit was used today in the Prestige Raid. This was not the specific exploit we were checking for and we don’t currently have the ability to detect it. Tomorrow we will release the top 3 finishers in the TWAB. You can make your own decision as to who should be celebrated."
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#destiny2
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Who cares? It's just a game.