The guy was damaging/rampaging in the store and had an exposed gun, creating panic to the people around. Did he think he was OK to leave the store and nothing? The suspect had very little leeway of not following immediate instruction by the police. It was just yesterday that a person went inside a busines in New Mexico and shot several people. It is easy to monday morning quarterback the police.
Yes - pulls the weapon out of his waistband, except for the part where it was in a zippered holster:
The man said he saw Scott reach with his right hand and pull out what appeared to be a gun in a zippered holster. He recognized the holster, he said, because he has one like it. Officers then fired, and the man saw the gun fall out of Scott's hand. The witness did not see Scott point the gun at officers.