What's the deal with Sports Jiu Jitsu? My son studies Tae Kwon Do and his school has been having an exhibition event during his tournys called Sports Jiu Jitsu. It involves typical TKD sparring except when they clinch, strikes are no longer allowed as they grapple and do traditional JJ moves. Is this new or simply a combination of JJ and TKD? I researched it on YouTube and it seems like there's even a big tournament in Europe. Any thoughts?