I applaud Xanth for not letting protocol or fear of retribution cloud his judgments. Celtic is a special case, and I don't think you've been here long enough to understand that, LastWish.
This isn't an isolated case. Celtic is constantly being an ass, and always trying to find new ways to be one. He's the same as he was the first day he stepped into the server. He's been banned, I don't know, five times? Each and every time, he's come back, crying and saying he's changed, and every time, Particle believes him. A month or two goes by, he becomes a huge ass, and gets banned again, saying he'll never come back because TRPG is boring. Then, the cycle repeats.
Not only is Celtic an all-around ass, but he's also constantly attempting to get Peacekeepers and Admins in trouble; even you know that, LastWish. I remember your dealings with him. As I've said before, he's the same now, and always will be. Don't get on Xanth's case for dealing with it.