You have an organized club with a history in the location you are currently at. I would think that one could make a case for malicious intent on his part because he is flying a mile away from an organized site with the FULL knowledge of the danger he is willfully creating when he does.
Free membership indeed! You might find that more members than you want will start flying with him....
Or maybe THAT'S the idea. Find out where he is and who's permission he has to fly there and start that way.