I believe the man is Jack Dougherty.....
The Chapman provided clip is Only maybe 2+ seconds in length. It is only a snippet of the clip I have seen. The film clip I have seen is maybe 5 seconds longer and Not as clear as the one Chapman provided. That Chapman snippet is Very Clear.
maybe 2+ seconds in length The snippet is 1:15 in lengthLook at the bottom left corner
Come on Chappy, You are better than this. NOT Much, but a smidge better. We are seeing the same snippet over and over and over with a Zoom involved.
I don't recall seeing Jack Dougherty acting like a Jack in the box.... But whoever this man was he was very tall ...... He certainly fits Truly's description of Jack Dougherty
From the Jack Daugherty thread....Mr Scully supplies possible images of JD---- https://www.jfkassassinationforum.com/index.php/topic,1435.msg38636.html#msg38636