Trolling or afk when team-mate having bad game.

There is this player whom i reported a few days ago for AFK after he lost his lane as Galio to Syndra mid. Even our jg is kind enough to give him blue at level 1 yet he rage and went afk then never came back with score 0/3 only in early game. Then today, i checked his history match, he went trolling as shen support with 0/11 with 6 null-magic mantle. There is also another game as Ryze but he went afk also at level 7 only. When he is carrying, he stays. If he feeds, he either trolls entire game or goes afk. Players like him are the true definition of pure cancer to the team.