Levi said Sarah was not a hunter and did not know about guns... this video confirms it.
If she hunted moose and caribou she would be totally familiar with how to hold a rifle properly and how to properly place it in her shoulder. If she had shot a high powered rifle the way she first positions the M16 in this video, she would end up with a broken shoulder.
She looks absolutely clueless about guns in this video... look at how she first positions the gun at 13sec into video.... the instructor has to reach over and push the gun down to a more proper position. She still ends up firing it with the butt of the gun too high up on her shoulder.
Judging by the absence of smoke, shells and real noise, it was just a pretend shoot. Observe the position of the rifle and other details in this next video. It was shot with a silencer.
(H/T to UQ for providing links and commentary)