Losing intentional

Today i got a kayn on my team with an avergage of 12.3 deaths and 10% winrate. When he was on my team he was 2/9/1 with 54 cs (he was kayn mid btw.) To my opinion it is inting (intentional losing.) He should be banned, but riot probably wont ban him, because riot only sees inting as running it down mid. I am sure he wanted to lose. Just everyone know he was intentional losing and riot should ban him and not seeing running down mid the only way as inting. It was high plat/low diamond game btw.
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