Of course, regarding this particular professor’s (???) childish lie of a column, deadly force employed in self-defense is certainly legitimate if one reasonably believes that one’s life is in danger.
Having one’s head banged on the sidewalk, IMHO, clearly fits that bill. Just to get into all the minutia (since we’re talking about a “professor’s” column), one could reasonably assume that one would soon be rendered unconscious, after which, given the maniac bashing one’s head against the sidewalk seems a rather hell-bent fellow, one could certainly reasonably assume that said fellow would continue the bashing after one lost consciousness. Ergo, it’s a most appropriate time to avail oneself of one’s weapon and finish the bugger off (IMHO), and I doubt it would take very long for the attackee to work through all these details in their mind in that situation.
So many Black youth perps seem to be unusually adept at the methodology needed to quickly and effectively subdue an opponent. From where are they learning these tactics and skills? Are they “instinctive”? Or is there (aside from the military) some sort of underground school where offensive and lethal hand to hand combat skills are being taught to Black youth?