Trolls are the cancer/tumor to the game

When Sona helping my yi leash my red jungle, she last hit my red and took it without saying sorry. Furthermore....after took my red, she didnt even help me to leash another jungle monster. Even further insult to the team, she let her adc to die while she flashed for a kill but end up letting enemy adc took double kill together. Best Support Sona NA ever!