You can report them via this link and it allows for uploads of video. https://help.bungie.net/hc/en-us/articles/360049497451-Report-Suspected-Cheating-and-Poor-Behavior Just don't expect anything to be done. The game is flooded with them and Bungie laid of their security team apparently. Had a Titan yesterday that scored 21 kills while the other 5 players could only manage 23 between us. Invincible and one shotting everyone. Had a high ranking but that doesn't mean they're not cheating. That's how a lot of them maintain it. PVP is broken and new maps won't fix it.