Watch as he outmaneuvers random strangers on the street trying to punch him in the face.
Fight Smart demonstrates the importance of head movement in a toe-to-toe confrontation. Notice how the other guys run out of gas after a few big misses?
This video highlights a few very good points, and brings to debate a few other good points.
Firstly, when you take big swings but make big misses, you seriously compromise your guard, but you also expend a great deal of energy. Stamina in an altercation is equal to survival.
Best case scenario would be to end the fight quickly and efficiently with as little expenditure of energy as possible. Theoretically that is an excellent viewpoint, but to focus from that view exclusively would negate the countless examples of fights turning into situations lasting longer than a few minutes.
Ask anyone who has ever fought competitively or on the street how long 30 seconds feels, and their answers should attest to how much energy one expels in such a small time frame. Again, many of these situations elicit a fight or flight response, and as such, the body dumps maximum energy into all systems and we red-line until that energy has been eaten up. The point of all of this though, is when considering survival in these situations, be sure that your tank can hold a lot of gas. Hit the Treadmill, Running Paths, Bicycles, or Pool in order to develop your cardio-vascular system.
Another side of the debate lies on technique alone. Martial Arts and Hand-to-Hand Combat Systems have long been in contention for who has the best anything. Avoiding strikes is no different that making them, and as such, techniques and methods differ greatly.
In this example, what we are viewing is excellent boxing technique. By keeping your head moving, it makes it more difficult to strike. By slipping and dodging, you are causing your opponent to a) lose energy b) open themselves up c) become frustrated or discouraged, and c) save you your looks. With these techniques though, you are breaking your alignment as you bend in order to dodge. In many classical martial arts, keeping your spine aligned is of the greatest importance for delivering effective strikes, but also for avoiding them. The debate between moving only a piece of the body, versus moving the body as a unit is one that should be considered carefully.
Boxing has perfected punching and possibly avoiding punches as well. We can argue as much as we want, but when we analyze the striking forces, boxing is able to produce far greater energy then all other techniques and has focused itself entirely on throwing fists. We can expect Taekwondo to be similar when it comes to leg strikes. What boxing produced though, while very efficient on the street, is based on a strict set of guidelines that may leave us open to attacks that it never needed to consider. A boxer does not worry that when he slips low and to the outside that a kick is going to be blocking that path.
On the street, we can never assume a person will strike a certain way, or respond in a certain fashion. As such, it may be a great skill to avoid a punch, it may be another one entirely to avoid a punch while protecting you from the next blow or assailant.