In this preview of UFC 139 from the official UFC youtube account at www.youtube.com/ufc Dan Henderson talks about his upcoming main event fight at UFC 1389 against Shogun Rua.  Henderson also talks about how they match up as fighters, how he believes he can knock out Shogun and lastly, Henderson discusses how he still has a lot to accomplish in MMA and is far from done with fighting at this stage in his life.