Before you start commenting on the fact that 12G is not a Big Gun, let me remind you that it is relative. When I taught my kids to shoot when they were younger I started them out on a .410. If you way sixty pounds, a 12G is a big gun.
On the other front, when you combine a petite person with a 12G and poor footing, and you are risking injury or death. If you watch carefully that is a semi auto and she takes a shot as she if falling. What would have happened if she swung that weapon towards the person with the camera as she fell?
Please be safe out there…