Ever been in a firefight? They don't last long, only seconds, maybe three if you're lucky. If you aren't prepared you'll miss the whole show, but you won't know the difference.... cause you'll be dead.
I recently encountered my first firefight. I stood 21 feet from my "attacker", locked my eyes on his, waiting for him to make his move. He went for his firearm and I went for mine. I drew first, and in a rush of adrenaline I put one bullet in his right shoulder, then a second in his sternum. Less than two seconds and it was over. With a bullet wound in my side I would survive. Had I hesitated I would be dead.