WOOO: That free shot of Bruce Lee's would probably be a heel of his hand into you nose. Being the much shorter man, Lee's upper angle would be almost perfect for breaking those nose (and surrounding area's) bones and driving them into the front of your brain. All resulting in internal bleeding of the brain, or an instant lobotomy. If not to the nose, then a under the chin blow (from Lee's better angle). Snapping the neck back, perhaps breaking the jaw pivot bones, overstress on the eye sockets, breaking/chipping teeth and if the tongue is not out of the way, cutting it badly...or off.
People forget that extreme power of the blunt force of the heel of the hand, always thinking closed fist. And you also save your knuckles that way. Try a quick and hard heel of the hand to the ribs sometime..should make a lasting point on anyone. Takes a certain amount of skill to use the heel correctly. Women are taught this stuff in some of the self defense classes (though most are BS teaching classes).
outby43 gives a great example of the form, tork, leg strength and explosive power of putting a shot. Which can also be used to describe a solid and powerful punch. Adding timing and quickness to both elements, to complete the process. Tork is not nearly talked about enough when it comes to fighting power. A punch will start from the ground up, in most cases. With the hips/lower back being a important element. Even turning the wrist, while striking a blow, can be important. Good Luck.