Ok. The dash cam shows him backing up and then shot once he turned away to look at the officer on his right side.
It was very quick. He probably had no time to access the totality of the situation at that point.
he was being told to put they were police and to put the gun down before the video even starts, we can hear him told to put it down a dozen times on the videos released... he is only shot after almost a full minute has passed on the video.