Enough is enough, any level of trolling in ranked needs to be made zero tolerance.

I just had a Diamond+ ranked game. Around half way through the game, our Tristana got pissed at our Garen and started intentionally feeding, but not blatantly.

In general, she would not group with us or push objectives. We realized she was doing this, and started grouping and following her, at which point she would just recall and go to another lane.

At one point, I was in the enemy base with her and two inhibitors down, and could have ended the game; she immediately jumped into their fountain, died, and said 'lol thought i could kill rengar.'

At the end of the game, she said that 'we deserve the loss,' leaving no doubt that she was intentionally feeding.

This behavior needs to be made zero tolerance. It's absurd that anyone should be losing LP to this, especially at high rating, and it should not happen as often as it does.