Did you ask him why he can't stay in one lane? You could always use lane 5/6, which he probably isn't using and, if he is, you have plenty of reason to complain about it then. You could always just have somebody stand there to make sure he doesn't run in it, if you have other people training. I just simply couldn't imagine this.
Here's an idea though, as the guy who claims to be an officer of the court what his name is so that he can get into contact with the police about this. You can also ask him that you want to file a report for assault for the man touching you.