I am reminded of the old adage...There is NO magic bullet.
No vital central nervous system shot, no spinal cord shot. Shot placement is king and this story is the proof of that.
Now...are
YOU going to be cool and collected enough, being wounded yourself to try for a head shot ? Highly doubtful. This store owner showed a lot of guts to keep fighting, going to a second gun when the perp was still a threat....
Not Monday morning quarterbacking, just pointing out the obvious.
In parlance...he done good.