How does one break baseball bats with his shins?

i was watching an ISKA special on cable and a guy broke a world record by shattering 11 (i think) baseball bats with his shins. i guess my real question is why this does not translate into fighting in the ring? i ume this guy would be destroyed by say, chuck liddell, but in theory, should he not be able to throw a kick to liddell's shin, connect, and win the fight? the "science" behind such techniques is still somewhat confusing to me, and it's curious that you rarely, if ever, see these guys actually competing in the ring.