If that's the case, then Wiegman, still in the car, must have started panning back to his right in response to the third shot.
You guys are proving there was a 2nd shooter. If Wiegman is, "panning back to his right in response to the third shot", why is Wiegman NOT panning his camera UPWARD toward the 6TH floor sniper's nest? Wiegman is seated in a convertible, sitting atop the frame of the automobile. Wiegman is seated, "almost on the horizontal". Wiegman is panning his camera, (his Eyes are searching for,) the sound which his Ears hear, "almost on the horizontal". A 2nd shooter from behind was placed, "almost on the horizontal", in "The Men Who Killed Kennedy" (1988) BBC. Wiegman's filming/panning is consistent with his hearing that 2nd shooter, "almost on the horizontal".