The guy goes around shouting "REVERSAL" and not only the heroes took so long to realize he reflects damage but no one figured it before them?
Also, I bet "he" will end up being a cute girl...or gay.
To be fair, the Black Knight is trying to get them to devise an entertaining strategy to attempt on him. As such he could very well be lying about anyone figuring it out that quickly. He also might not actually /need/ to shout "REVERSAL!" to make it happen.
at last one of these with no evil king who throws away the waste summon or evil prime ministers schemeing or arsehole heros, everyone has a heart of gold and its fun to read, even the demons are likable atm, cant wait for the next chapter