This animation focuses on the movements of Secret Service Agent Roy Kellerman, who is seated in the right front seat of the limo.
There is indeed a slight forward movement, but it starts only in z314.
In other words, this movement, much more slow that the violent one of the President, starts on frame later that the movement of Kennedy, and continues while the President has already begun his backward movement.
Follow this link to see the totality of Kellerman's movement.
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