Oops,
I forgot to mention that this scene was also seen on David Von Pein's JFK YouTube channel. The name of the video is:
JFK'S ASSASSINATION (WFAA-TV COVERAGE) (PART 2).
For safety's sake the link:
https://www.youtube.com/watch?v=Qy4Fv4xsM4Y&list=PL0O5WNzrZqIOp-NaY1P1TIr-zWKPVBL9Q&index=2
The film scene you are looking for appears after about 30 minutes and 35 seconds. The film also includes footage of Darnell and, as far as I know, other cameramen.
Sorry for forgetting to mention it.
Markus, thank you very much. Those clips, although very blurry (as you noted), leave me with no doubt the blurry clip I posted is indeed a Mal Couch clip.
As noted by Richard Trask in Pictures of the Pain Mal Couch and Robert Jackson bailed from their CameraCar3 after convincing the driver to let them off after passing the Triple Under Pass. Apparently, Jackson made it back to the rail yard in time for him to be filmed by John Martin Jr, along with Roger Craig etc. Couch probably returned to the plaza along the sidewalk that passes through the north TUP tunnel, and films this subject scene at Haygood's parked motorcycle. For me, this is a new film clip. I am especially happy the scene includes the peristyle wall shadow in the background. That shadow, along with the nearby wall holes (cutouts), can be used to timestamp the clip. Very unfortunate for me is all three versions of that clip (mine and the two you linked) are hopelessly blurry-so much I can't make out the wall holes at all!
There is an indirect way to timestamp the scene by noting the similarity to a photo taken by Frank Cancellare from atop the knoll. Below is the Cancellare image from Robin Unger's online photo collection.
That photo shows a peristyle wall shadow equivalent to about 12:32.
https://www.jfkassassinationforum.com/index.php/topic,2013.0.htmlAt lower right we see a man with thinning hair and hand in his left pants pocket. Near him is a man with his back to the camera wearing a Stetson style hat. In the street behind them we see the rear half of Haygood's parked motorcycle. I believe these two men are near Couch's camera and center frame in the film clip.
Other similarities with Cancellare's photo are Mary Moorman with Jim Featherston standing along the south curb of Elm. To their right (photo left) is a standing man wearing a dark jacket with white pants. Cancellare's photo includes Charles Brehm with his son, still at the south Elm curb. Brehm and son are not present in the Couch clip.
1. This Couch clip was taken very shortly after the Cancellare photo and puts the Couch scene estimated time at 12:32-12:33.
At my visit to the Sixth Floor Museum's Reading Room I briefly viewed their Couch film scenes filmed in Dealey Plaza. I noted early in my notes that the museum's copy is slightly blurry, about the same as found in many documentary DVDs. I made a timeline of the scenes but made no mention of this clip in my notes. I don't know if I just missed it or it was not present. I do know that now I will pay very special attention to the museum's version for this scene. My hope is the clip is that their clip has enough clarity to determine a time stamp from the peristyle wall shadow.
Thank you again Markus for taking the time to locate those video references.
James