Something fishy here. Why would he practice in front of the camera? Why not a mirror?
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The entire story is from Baldwin’s Public Relations team, and his agents.
Dollars to donuts he was fooling around with the gun, and enjoying scaring peeps with his legendary temper.
The others there will never work again in the Industry if they speak up.
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I think he was just killing time while the director and cinematographer were setting up the camera for the scene.
The earliest reports were that there was no film of the incident because the crews were still setting up the cameras for the angles required for the scene.
Baldwin may have been fidgety due to the delay, and started practicing his draw movements while the crew were still moving about. They may have even needed him to be in position for proper blocking of the scene in the camera's viewport. While he was standing there, the propmaster should have kept possession of the gun, only handing it to Baldwin when the director was ready for action.
-PJ