https://www.bungie.net/en/Help/Troubleshoot?oid=13967
Report them with the contact form at the bottom of the link above. You have screenshot proof. They actually will get a restriction or ban believe it or not. Bungie has been pretty on the ball on that stuff lately. One of my clanmates got a 2 week restriction on crucible and IB with just one report because he was frequently disconnecting due to a poor internet night. Another of our members got the same deal for being with him each time even though he wasn't disconnecting. They aren't messing round anymore I guess and actually handing out the banhammer.
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How in the fudge do you know he only got 1 report? You can't possibly know that.
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Regardless he got reported and restricted. We know it was one guy at least cuz he kept spam messaging him saying he was reporting him after he was put in a game with him a few times in a row. Just assuming it was just the one guy. Also, why even make this post? It has nothing to do with the OPs problem nor does it help them, and just makes you seem argumentative for no reason. Round these parts we call those people an asshole. :)