Anyone who has fought in the ring, cage or on the street knows how fast things can happen. In a fight, your anxiety level increases and your ability to think is affected. Often, you will see a fighter revert to the style that was his first (his base) or to the techniques he has trained the most over the years. An example of this is a wrestler who has started training MMA (kick-boxing, Jiu-jitsu, etc), but during his fight takes his opponent down and holds him there instead of using his new skills.
I mention this to make several points. It is important to control your anxiety so you stay in control and make good decisions. It is important to train with good form so that when you revert to techniques you do them well. But, I want to focus on the mindset you are in when you are “under fire.”
You often see a fighter’s corner yelling at him to use certain combos or techniques that will work in the situation. An example is someone yelling, “Elbow!” If both fighters hear and listen they will both be reminded to use elbows. If only one fighter hears, the first time he hits his opponent with an elbow (and doesn’t knock him out) he is reminding him about using elbow strikes and in fact encourages him to use them (I call this the “hit you back” effect).
This also applies to someone in a self-defense scenario. Know that if you try a technique you learned in a self-defense class and it doesn’t work or you miss, you have just made the attacker mad and given him ideas about what to do back to you. Be prepared for this. If you don’t know the defense against a technique, don’t use it.
Train hard and keep learning.