Ninjitsu = assassination/stealth entry and escape/sabotage It's more akin to being a Navy Seal and they of course use lots of weapons and booby traps. They've watered down the hell out of ninjitsu to be able to train it as a fighting style here in the states. No, you won't be seeing to much, if any, ever, ninjitsu in the cage, unless some guy sneaks a dagger in his compression shorts and stabs his opponent...or the ref, or some high priority target in the audience to gain favor with his shogun...oh wait it's 2011, the Japanese feudal system is gone =(.