What to do when someone is trolling in champ select
So just sat through a ranked champ select, someone accidentally banned ahri while our mid had her selected. The guy who wanted to play ahri (who no longer can) now locks in janna, ghost and cleanse and types in chat "Ready to feed :)" What is the best course of action here? Someone dodged thankfully but how can I stop this from happening without dodging? How can I give the person who locked in Janna a report or something to stop this from happening? Is there even something I can do about this? What would you do in this situation?
EDIT: Just had a guy ask for adc, to me not responding locking in udyr support with cleanse and TP, seriously what do I do. (His summoner name was "Habbibi") I even have a screenshot of it