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The guy was shoved, HARD, and landed HARD. The shock of being attacked like that alone makes me inclined to give him leeway on his response.
We are average people who carry guns for SD. We are not operators, badasses or expert gun fighters. Our sidearm is for one thing and one thing alone, too save our bacon when we are physically threatened and the physical threat needs to be one that is significant enough to produce, at the least, a nasty adrenaline surge. Florida's SYG seems to acknowledge that, even if some of you are not.
Should we train to handle the shock of being attacked? Yes. Should we train to have better situational awareness? Yes.
But expecting us to be experts or for that training to be perfect is unrealistic and defeats the point of CCW in the first place. Our sidearm is so we can live out our lives with a extra layer of safety, not a reason to not live our lives as we see fit in effort to avoid any and all potential conflict. (Which includes being an obnoxious parking lot monitor if one is so inclined)
No one, CCW or not, should go out looking for a fight. No one, CCW or not, should act like an ahole and, NO ONE, CCW or not, should escalate an argument into a physical confrontation.
However, there is no law against the first too. There are laws about the last one.
In this situation, the only one who broke the LAW was McGlockton.