I.. w.. how does..

Please do explain how this relates to the fact that running onto a battlefield half naked will get you killed? I wonder where you get all this information, too, because I've been practicing martial arts for enough years now to know that when someone has a knife, you better try and see if you can run away first. Pointing out those few individuals that were skilled enough and devoted enough time (i.e entire lifetimes) to this stuff isn't enough to make this point valid. 

Besides, Musashi dueled that 1 guy with a wooden sword that he cut from his paddle to infuriate the enemy. Not because he wanted to be cool or impressive.