My last ranked match was bad because we got a player who choose Teemo as support. Before the game started he asked if he could go mid and our mid lane player said no so he instantly banned mid player's champ. Just right after the game started, he rushed mid and fed their mid lane player a kill, after that he was hiding in a bush and never helped our ADC from dying. When i was going drake he told them where i was and made me died, same thing happened when we were killing baron, he told them where we were so we died again because of him. And he did was hiding in a bush with his mushrooms.
I reported him but i don't think he will be detected but what do you do if someone on your team is trolling?