...We know that to use deadly force you must be " in fear for your life". Ergo it seems that most cops and courts would find that if you were well enough in control of your emotions and reactions to carefully place the third round to the head perhaps you were not truely in fear for your or someone else life...
They would be incorrectly defining "fear" to mean only a paralyzing or chaotic loss of rationale and control.
Having the courage and maintaining the control to react does not negate the element of fear.
The absence of fear when it is warranted would be more akin to insanity than courage.
Courage is simply overcoming these natural side effects of fear and managing to do what needs done.
Preparation, training and practice, both mental and physical, help to accomplish this.