Let's give him a piece of our minds!!!
If he doesn't have principles regarding all forum users, especially tournament participants, then this is, at the very least, DISRESPECT!!! If I could say something that wouldn't get me banned, I would definitely do it!
What bothers me the most is that he opened his mouth and said: "Me? What are you talking about? Nothing like that happened - it wasn't me!" - lie to your grandmother!!! I suggest changing all his nicknames, for example, to: liar, deceiver, etc. I wouldn't tolerate lies...