Please note that the gentleman that Van used in his illustration did not lose his limbs in a fight. He is Hsieh Kun-shan, an individual who overcame a horrific work-related accident at age 16 and has gone on to become an accomlished painter.
For further reading on his life you can visit the following:
http://taipei.tzuchi.org.tw/tzquart/2004su/qs2.htm
Elbows are wonderful, wonderful weapons. Easily trained, very effective with little to no conditioning and generally unexpected.
Mike - I'm totally confused by your definition of a jab.
...jabs tend to be long range techniques with most of the forward potential used up....
That seems to me to be the opposite definition of a jab. In a jab the target is well within range and the limb need not fully extend to make contact. By that definition a jab is a short-range technique. Quick in/Quick out.
I'm not doing a good job of keeping up with everything that's going on in this thread. There are many valid points being put forward and I'm also glad folks have been clearing up confusion as they go. That helps everyone stay in the discussion.
I'm still focused on the idea that a human isn't a heavy bag because humans come with an electrical system in addition to a lot of semi-liquid mass. Obviously if you hit most folks hard enough they fall down - but I might not be able to generate that kind of shotgun power. So then I need to think about doing more with less.
Slap someone across the face and you get pain, flinch, possible damage/dislocation to various joints/bones, possible ring in the ears and an upset of the body's balance. That seems to be lots of good stuff in a small package. Everyone can slap and with a bit of training most can slap good and hard.
Slap a heavy bag and it might swing a bit...but unless you're a nice big strong person then what you'll feel is a sting in your hand and the bag will kind of bounce in place.
So a technique that is very effective on people really doesn't look like much on a heavy bag. This is the disconnect I see in some training. Folks bang bang bang away on kicking shields, focus mits, and heavy bags...but are they learning how to strike people well?
Obviously some of it works well because boxers knock each other out on a regular basis. However Mr. Tomoyose told us a little folk tale that when the young boys would fight in China with closed fists they would let the boys fight. When the boys opened their hands then they would be pulled apart for fear that now they would injure one another.
Just a folk tale...but could be an important lesson.