Apparently the server was a Zombie Deathmatch but there were no zombies.
You have me to thank for that :D
You don't really have anything on him if he didn't claim to have built it. And he was using the **Bluzone title or trademark or whatever you want to call it. I think he was legitimately attempting to recreate your server.
From what I saw with your one-sided conversation with him he looks to be a total douche, though.