Great that the perps didn’t get any money and the business owners didn’t get hurt..
But, the security guard needs more “gun control”. Two shots at fairly close range? I agree a shotgun would have been a better weapons choice.
He was able to unsling his rifle and return fire while under fire. He repelled the attack against a numerically superior force and advanced to take cover behind the front door (which is probably steel). He was wounded the entire time. I think he did just fine.