Kickback, these weapons exert force that can only be controlled by full grown men with muscles in their arms and chest and back and strong shoulders, this was a little girl, with skinny little arms and no muscle control to handle such a weapon. Its criminal negligence. Recoil sent the weapon over her head. It was Kickback and muzzle climb she could not control. Because she is a nine year old girl, a child. Its a strength, control, issue. With this weapon its way beyond finger control. The weapon exerts force and moves with force against the person handling it.
The weapon recoiled, the muzzle climbed and it kicked back, against her and the weapon rose above her head as she was incapable of controlling it because she was not strong enough, and its on tape so no clairvoyant required.