Eyrie,
Lets look at this example. The usual explaination you see for it is sweeping a punch across your body and striking to the solar plexus with a spear hand. I don't know about Y'all but I'm not sure I could drop anyone let alone a conditioned athelete with a spear hand to their wash board abs. On the other hand I'm pretty sure that I can get to the cleft in the throat just above the clavicle, straighten my arm putting my girth behind it. GEEERK!!! that hurts like a MUG. That approach my give me time to get the heck out of Dodge or call in the calvary or perhaps a little GandP.
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So there is a principle I guess. Greateast force to the weakest target.