I would say John Orr has either a very active imagination or very poor eyesight.
I'd love to know what they see that tells them that. I see JFK calmly lowering his right hand after having been waving to the few remainin spectators on Elm St.
Oh, brother. Another so-and-so said argument. It is completely at odds with what I see in the Z-film. I see JFK acting very calmly lowering his right hand while turned toward the spectators. I'm not going to bother looking it up but I seem to remember somebody on this forum saying those women indicated JFK smiled at them. That doesn't seem to dovetail with a "severe external stimulus".
HSCA report: "The panel noted that at approximately Zapruder frame 200 the President's movements suddenly freeze, as his right hand seemed to stop abruptly in the midst of a waving motion. Then during frames 200-202, his head moves rapidly from right to left. The sudden interruption of the president's hand-waving motion, coupled with his rapid head movements, was considered by the photographic panel as evidence of President Kennedy's reaction to some 'severe external stimulus.'"
HSCA photographic panel: "By a vote of 12 to 5, the Panel determined that President Kennedy first showed a reaction to some severe external stimulus by Zapruder frame 207, as he is seen going behind a sign that obstructed Zapruder's view. ... At approximately Zapruder frame 200 , Kennedy's movements suddenly freeze; his right hand abruptly stops in the midst of a waving motion and his head moves rapidly from right to his left in the direction of his wife. Based on these movements, it appears that by the time the President goes behind the sign at frame 207 he is evidencing some kind of reaction to a severe external stimulus."
I have no more than a neutered pug in the fight, but on one side we have (1) the HSCA photographic panel, folks like Orr and any number of others who have studied the matter intensively, and the lying eyes of women who were standing right smack there at the time, versus (2) what John thinks he sees in the Z film. Ho-kay ... Maybe the severe external stimulus was Jackie's cheap French perfume.