If the figure that appears to be a man in the pergola behind Sitzman and Z had been a man with a rifle he would have had to have fired the rifle from his left shoulder...Very few rifles are made for left hand shooters....and the firing of a right hand rifle is awkward for a south paw.
Walt,
Maybe so, but that is an opinion of what the gunmen did. What's if a left-hand rifle was provided, that is opinion as well. Nobody knows, the only thing that we know, because there is factual evidence, is that shots were fired from the pergola towards JFK.