Not really sure either of these scenarios classify as cheating. Scummy/griefing....sure. Cheating....you’d have to do a lot of lawyer-esque type convincing.
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Something needs to be done about it. Especially when there are multiple clips of it.
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Well all you can do is report. It’s up to Bungie SRT if they deem punishment is needed/warranted.
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Only thing to do is report and move on