Riot need to implement a heavy penalty for those who troll.
My previous 2nd game as Talon went horrendously wrong since the start of the map. Just because of a small insult among one the team-mates, resulting annie support went on a full feeding troll spree. She went to buy 6 different boots just because our jungle gave her a minor insult. She purposely went infront of enemy Nasus to get killed and making him fed or tower dive any lanes she feels like to. Riot should really look into these player behavior and implement a heavy penalty for them. Check my match history for proof.