15. The general that hearkens to my counsel and acts upon it, will conquer: let such a one be retained in command! The general that hearkens not to my counsel nor acts upon it, will suffer defeat: let such a one be dismissed!
16. While heading the profit of my counsel, avail yourself also of any helpful circumstances over and beyond the ordinary rules.
17. According as circumstances are favorable, one should modify one’s plans.
Even while using his recommendations and theories to guide your defense, his also recommends using any helpful circumstances that occur. If the circumstances are covered by the rules he supplies, Sun Tzu recommends making use of it anyway if it will help your situation.
Therefore, in a self-defense situation, when something helpful happens integrate it into your counter strike. For instance, the confrontation or fight takes you to a spot where you can duck into a room and lock the door to escape. Take the fortuitous opportunity. If your opponent slips on a greasy spot on the floor and stumbles, take advantage of it right away. The list is endless to a creative mind. The trick then is to spot them when they occur naturally and then make use of it.
Use the environment to supplement your skills and situation. Leave comments below if you have ever used some of these principles in your own self-defense situation.