I had a self-defense instructor once who was discussing the "myth of the unarmed man". He reviewed a case with us from New York City, in which a guy who was an artist with no arms got into an altercation with another man over a woman, and ultimately killed the other guy by bashing him with his head and feet.

The point, of course, was that there's no such thing as an unarmed man from the perspective of use of force, because there can always be a disparity of force that becomes dangerous to you.