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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Cozmo's / bungie response to this is pretty much an admission on their behalf that: - they know the ammo economy in their -blam!-ing game is currently broken - they know that ammo shortages that were criticized in the beta are still an issue, especially in raid and some strikes phases that are tantamount to horde mode add cluster-blam!-s and that bullet-sponge yellow bars DO NOT always drop ammo (their supposed "fix" based on beta feedback) - that they know they should have known better and should have seen this coming when they removed synths, nerfed damage output on all heavy weapons, and turned shielded adds in bullet sponges - that if they actually performed proper playtesting with more varied groups than the usual bunch of in-house try-hard neckbeards who probably worked on designing these encounters, and acted on that "3rd party" feedback BEFORE releasing wanna-be-3l1t3 shit out there, then no one would even bother with dumb ass exploits like this. Destiny 2 Raiding ladies and gentlemen... No CP. No loot. No ammo. Funtimes!