Dodge to keep the team from experiencing the "MID OR FEED" clarity/clairovoyance Nunu, get punished.
~justleaguethings.
For serious, though. Please install a report system in the pregame lobby, which can optionally kick a troll from your team and/or restart queue. I don't mind people who are just trying new things, but getting people like that (who don't get punished for it) really ruins the experience for everyone.
Toxic people and trolls should be judged even before a game starts. Nobody wants to play a 20+ minute game with someone who is just gonna act like an angry child all game for -INSERT REASON HERE-.
Please Riot. The community has been asking for this sort of thing for a while; it would not be hard to implement, either. It would help teach more players the repercussions of being selfish and doing spiteful things without any regard for the other players on your team.