If you watch the video of the shooting you will see that those captures are of the same person:
https://twitter.com/dancohen3000/status/1347076676342185984
The video is shot from the stairwell where Ashli and others were escorted. You will also see that the background is a corridor NOT the chamber.
These images are not from the same place at all.
As the video images are from outside the chamber, you can see the passage in both.
You wrote:
You will also see that the background is a corridor NOT the chamber.
I'll give it one more try. The man on the right holding the gun and the baton, was captured by the video after the lattice was removed and the glass was broken. His position was defensive, he was not the person with the black and white bracelet. His hairline is receeding, and his hair is a light colour.
There was an interval between his image in the chamber and the removal of the lattice and the glass. The images are from different perspectives. One is a photogrpah from inside the chamber, the other from the outside.
But both captures of the hand holding the gun are from the passage outside the chamber. They are NOT the same hand. imo.