give it him back. see if he can take it as well as give it out, if he goes home with bruises every wednesday, or gets booted all over the place then he's unlikely to turn up. or if he reacts to a challenge and starts trying to fight, the organisers have an excuse to boot him out.
there was a really competitive older guy who used to play with us in my old job, he'd charge into to tackles, rip his legs apart on the astro by slide tackling, ram people into boards and all sorts. everyone knew though that when you were up against him in a tackle you knew what to expect - if you didn't go in as committed then you'd come off worse. it was quite good fun in the end, he was never dangerous, just committed.