There was no imminent danger of death or grievous bodily harm. The one who jumped the counter clearly didn't even head for the clerk at first. Besides, both of those guys looked like they could have been effortlessly flicked away like the little snots they are, and were, respectively. Fight back in defense of property, yes. With lethal force, in the case above? You have to be outta your mind.
See, to me, I've never been in a fistfight. Not as a boy, not at all. Did not play contact sports - I wore sweatpants over my jeans and boots in Phys Ed so I wouldn't have to change out of my preferred attire. There are tiny people who have been scrapping all their lives and are quite capable, and, while it appeared he knew these two... I would absolutely not feel "confident" to "flick away" or physically deal with, without issue, most people in general. Most teens I see walking home from the high school, come to think of it, are larger than me, at 5'4. Not without boots, or spray, or some force enhancer, and not even then, as I do not believe I have pain tolerance yet, or enough exposure to it - this is what I hope martial arts sparring will give to me. The idea of a real fight is a scary thing to me - where I don't pick up on what's happening and move, run, jump, hit first, whatever... and I actually get a few boots in my ribs or fists in my face - I'm worried I would not be able to react. I'd assume a lot of people these days are like that, unfortunately.
Once, when I was about 15-16 years old, a female friend who had a bit of an older-sister relationship to me (who was also a "street punk" who travelled nationwide until she cleaned up her act a few years ago, became an addiction counselor - very tough girl, carried a lock-sock for the men that would creep on her while street-sleeping in big cities), gave me a very gentle "butt-whoopin'" after I smarted off one too many times after drinking alcohol, something I did do as a teen. She had such comparitive experience as a fighter, she was able to "hit/punch" me off of a bench, lower me to the grass, and proceed to "pummel" me a bit. She didn't leave more than a bruise on my arm, but to me it felt like a real attack. This, in her world, was a friend teaching another friend a lesson when they got out of line. Morality aside.... I do not have the training yet, to be able to "effortlessly flick away" a woman who weighs less than me. (Not that I tried, I just covered my head when the light pummel came, I am sure had I tried, I'd have been unsuccessful.
It is incredibly sad. I hated to see him get hit in the neck like that. I understand an untrained person in a fury of adrenaline was just in a flurry, but ierno... what do I want, for everybody with a boxcutter to get MBC lessons? Sad situation, indeed. A lot of musing here, I know, my apologies.