When you train in the martial arts for the primary purpose of self-defence, it is important to train beyond the forms of traditional martial arts styles and sporting competition. You must learn to use truly effective techniques that can bring down a stronger and larger attacker whose intent is to harm or kill you or your loved ones. To counter the aggression of a real, violent attacker, you must use martial techniques that have the power to maim or even kill. There are important ethical and strategic considerations to be aware of when you use deadly street fighting techniques.
Avoid a Fight at All Costs
A true martial artist seeks to avoid fighting. You'll find that when you can employ deadly techniques in a real situation, you gain a quiet calm that allows you to walk away from a fight and let go of ego needs. You don't feel the need to be provoked to fighting by the words of others. If a violent encounter begins to take shape, try to talk your way out of it, or simply walk away. However, if an attacker makes a physical threat, you mustn't hesitate to use your skills. If you have done your best to avoid a fight, you can be assured that you have acted morally, regardless of how you may injure your attacker.
Wound to Degree
Famous martial arts instructor Paul VuNak speaks about "wounding to degree." You wouldn't use deadly fighting techniques on an uncle who gets out of control at a party when he's had a few too many. Once you learn the "deadly" techniques that can save your life in the street, refine your techniques so that you can adjust your force appropriate to the threat. You don't seek to cripple or kill, but that doesn't mean that you should allow a violent attacker to harm you out of sheer compassion. Stopping an attacker doesn't mean you need to break bones or kill, but if you have done your best to avoid a violent situation, then an attacker earns whatever he gets.
Do Not Hesitate
Once a situation becomes physical, you cannot hesitate. When an attacker makes a violent move, a switch must flip inside you and you become the attacker. Nothing is gained by reacting and trying to keep up with a flurry of violent attacks as they occur. If an assailant has a knife or gun, you may be unable to defend yourself after the first strike. When the confrontation is activated by your attacker, you must strike quickly and decisively, driving forward and continuing until the person is subdued.
Leave the Situation
You're not in a movie. Don't stick around to admire your work, or out of a sense of legal or moral obligation. Your assailant may have friends nearby, or random strangers may jump into a fight if they see one. If you are coming to someone's rescue, he may turn on you, if the situation is misunderstood. Leave the situation immediately. You can call the police or medical personnel safely from a secure location. If you are charged with fleeing a scene, it is better than being hurt by another attacker you didn't expect.