Boosted Account in my Ranked games, what do I do?

Had a Jinx in a ranked match earlier and checked him out after losing badly. But the Jinx said she was getting boosted and gave us a link incase any of us wanted to be boosted. The person was 346 wins, and 1 lost. And last season was low silver and is now on a non-stop winning streak. So myy question is do I need to tell Riot and is this legal in game? Or do I have to deal with more boosted people in my promots?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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