Most fights are over in seconds
Most fights are over almost as quickly as they begin. Once one of the combatants received a powerful blow, he or she will will be at the mercy of the opponent.
Blocking and countering is unlikely to work
Blocking works fairly well at long range or when you know exactly what technique the opponent is going to use. Since neither of these situations is likely in real fight, it is almost impossible to block and counter an opponent’s punches at close range.
Real fights are not like sparring matches
In a real fight, there is no limit to the techniques that can be used and there will be no referee to ensure fair play. Real fights are violent and repugnant. Your opponent can bite, gouge your eyes, seize the testicles, spit, use weapons, etc. Losing a real fight can result in permanent physical or mental damage, or even the loss of your life. You must be prepared to protect against, and use violent and repugnant methods when it becomes necessary.