Did you see the video of this crime? It seemed to me very odd that the shooter approached the victims slowly, while recording it with his camera, and none of them took any notice of him. Presumably, there were not many people up and about in that shopping centre at 06h45, but he warranted not a glance.
Later on, he stood behind the camera man aiming the pistol at Ms Parker for what seemed to me like a long while, at a short distance, and still none of them noticed him.
I am not so sure that if any of the victims were armed, it would have done any good.
The survivor said she didn’t see him because the light on the camera is so bright it blinded her from seeing behind the camera man.
The shooter probably knew they couldn’t see him.