And self defense would be the last thing on your mind. You want the alleged perp dead. You may pay later in court. Be careful who you deem worthy of your ire.
Because it takes time for bullets to have an effect, guns can in fact be emptied before the the person being shot even starts to fall down. A revolver can be emptied in less than a second, though most people are not that fast.
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You assume far too much! More than likely, Judith Anne was trained as I am: do not draw, point your weapon at another human -- or fire -- unless/until the situation is "in the gravest extreme". When the situation has reached the point that you must fire, continue to do so until the threat is eliminated.
It would take an almost incomprehensible threat to cause me to fire at another human; but once that threshold was passed, the combat training would kick in, and there would be no stopping until the situation was rendered safe.
You, OTOH, have obviously never had serious threat response/responsibility training -- or you do not consider your life or the life of your loved ones to be worth defending.