Just had a troll on the enemy team

Now I know statistically speaking it's not an issue, but I always feel like something is a tad bit off when a blitzcrank with smite ghost and warlord's bloodlust building attack speed items and starting boots and 4 pots in the jungle with another jungler (ie he was supposed to support) can do this but fill chat with things like "Close game" and "Wp man you're so good" and not trigger a review. It's malicious intent using kind chat as a means to dodge the penalty in the system. He did not admit to anything in chat. I feel like the system won't be able to detect this kind of behavior because it is hidden. I'm posting this especially because it was on the enemy team, so that way it doesn't come across as me calling him a troll because he made me lose a game.