Hello guardian,
When you believe someone is cheating the best thing you can do is use the in-game Report Player function: https://www.bungie.net/en/Help/Article/12960
Additionally, you may report suspected cheaters at the following Contact Form: https://www.bungie.net/en/Help/Troubleshoot?oid=13967
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Cant really report when all your teamates are kicked to dashboard and dont have the carnage report to report in game.