From what I remember about this case, the pharmacist saw the guy still reaching for something on the ground or trying to get up after he was telling him to stay down. The camera in the store did not have an angle to show the criminal on the floor.
I would have believed the store owner that the criminal was still a threat.
The coroner and forensics said that the flat on his back, hands out, unconcious, brain injured robber never moved, even as the five bullets were being pumped into him.