If you don't know who Gary is look him up. Dude has crazy jiujitsu skills. Bet GSP wins his comeback fight by sub lol
Ah. I searched for Gordon, Tonen + Firas and got this; http://www.istt.com/index.php?page=...n=com_virtuemart&Itemid=62&vmcchk=1&Itemid=62 "Punch penetration test for estimating machine performance"