You mean the one shot and lying on the floor?
Then that's for a jury to decide. I've seen the tape of the pharmacist claiming the wounded robber made noises and motions the pharmacist found threatening; but if I were a juror, I would dismiss that as something his lawyer taught him to say. (Particularly since in the same video, the pharmacists spends the first several minutes talking about how he thought one of his employees had been shot to death, which makes his execution of the robber a revenge killing, not justifiable self-defense.)
Personally, I think a shot to the head is rather effective restraint. Since the pharmacist left and then returned to step over the wounded robber, and the pharmacist twice turned his back on the wounded kid, I'm satisfied that the pharmacist also thought the wounded robber was restrained by the shot to his head.
I wonder if posters here would be so quick to defend the pharmacist if he had tied up the wound robber and then executed him. Because in essence, what the pharmacist did wasn't all that different.
Well did the pharmacist even know the would be robber was shot in the head? How do you know the would be robber wasn't moving? After all even if he was seriously wounded he could have been making noises and twitching. Why do you assume he wasn't? You are assuming the pharmacist knew the would be robber was incapacitated. I don't assume any such thing. And it's definitely not the same as tying someone up and then shooting them.