For a clearer demonstration of the sharp camera movement— her jiggle reaction to the first shot— during the seven missing frames of the Tina Towner film, see my short video:

https://www.youtube.com/watch?v=E_N3QoiJE_E

Read the accompanying text and note the sharp jump of the marking lines within 0.307 of a second. Other than the Towners, the FBI were the only ones in possession of this film. They made the splice to cover up a very early first shot.