Yes, except he still reached behind his back again for no rational reason, after being told twice he'd be shot if he did.
I don't think he toyed with him. The cop is either following overly complicated protocol in such a situation (not his fault) or is confused himself as to handle the collar. He could have popped the guy the first time his hands went behind his back if he intended to kill him.
There has to be procedural flexibility to allow for someone going brain-dead under the pressure of staring at a gun barrel, a recognition that we may be dealing with someone who is either not too intelligent, confused, or perhaps even handicapped. He could have been arrested while lying flat, which makes the shooting unacceptable.