Jerry - Thanks for posting the Landis snippet from his "Original Report" along with the visual aids/still shots. I am not sure what your position is regarding Landis having seen a motorcycle at the Elm St. curb There is no way Landis was referencing the Hargis motorcycle. The motorcycle Landis saw/reported, along with the Black Male were both on the (N Elm Curb. The Hargis motorcycle was on the (S) Elm curb.
"As we passed under the overpass, I was looking back and
saw a motorcycle policeman stopping approximately where
I saw the negro running."
Well, I don't see in Agent Landis's statement the word "curb", much less the words "N Elm Curb".
According to the Mark Tyler animation "Motorcade 63" (
Link ), other than the one driven by Officer Hargis, one of the remaining three motorcycle escorts that were just behind the limousine did stop for an extended time (the cycle driven by Officer Douglas Jackson). So you may be correct about a cycle stopped near the north curb but you are incorrect about "a different cop that history has failed to ID".
The motorcycle escort of the Presidential limousine. Left-to-right: Officer Chaney, Officer Hargis and Officer Martin. Officer Jackson is out-of-frame, camera-left. Jackson was the escort rider nearest to the North Elm curb.
The Nix film documents most of Elm Street between the concrete wall and the Underpass just after the head shot. There is no mysterious motorcycle recorded in that sequence that could be the motorcycle seen by Landis other than one of the four known escorts (which we can narrow down to Jackson or Hargis).
The film shows all four escort motorcycles slowed or stopped, while the limousine traveled away from them. The three cycles that are suspected of having stopped are roughly opposite the pedestal used by Zapruder when they go out of frame. The one cycle seen still moving (though it soon goes out of frame) is that of B.J. Martin.
The limousine and followup car are then picked up by the Bell Film. The motorcycle seen in that clip is that of B.J. Martin, traveling on the southernmost lane of Elm.
| | The motorcycle of Officer B. J. Martin (southernmost lane of Elm) is followed by that of Officer James M. Chaney (in the northernmost lane of Elm)
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By then, Officer Jackson might be on the move since he said he left Dealey Plaza with Chaney. The Mark Tyler animation shows Jackson begin to move four seconds after Chaney resumed moving.