One thing that caught my interest is how a differently a cop would have responded.
Guard is very much like Dirty Harry. Walks in, begins firing.
Most cops would wait for backup. Flank the entrance and out of sight. Confront thieves outside the store to prevent hostage situation. Shotgun out and aimed at suspect. Shout, "Police! Don't move *expletive* Hands up *expletive*" or "Police, drop the gun *expletive*!
Instead the guard walks in blasting and then tells guy hands up. Then hands behind the back. That's a no-no. There could be another firearm behind his back. Keep the hands in sight please. Climbing over the counter was a shocker. He's at a disadvantage while in transit. Turns his back on a suspect.
Still, despite all his mistakes, he came out Dirty Harry cool and clean. I give the guard a lot of credit for his bravery and coolness under stress.