This video wont last, Elite XC doesn't understand free publicity:
Kimbo was to fight Ken Shamrock. Ken gets a cut and cancels, Kimbo offered alternative of fighting Seth Petruzelli from the undercard and took it. Never a good choice to take a pro fight against someone you know nothing about.
He found out...caught coming in, goes down and punched hard from behind and ref stopped it for a TKO because he couldn't defend himself.
Game over.
That likely ends the debate on whether a tough street fighter can jump into MMA against professionals and succeed. Kimbo probably has another fight in him, perhaps the intended Shamrock fight. He has to win that convincingly then take out Seth in a rematch. Else he's done.