If hearing was a problem while running, the sports of basketball and football would need to do something different than have referees with whistles to stop play.
Greer is a two shot witness right up until his WC testimony. Like most people he then added a shot.
Kellerman when pressed in the WC interview explained the second shot was the head shot. The flurry of shots explanation then disappeared.
Its strange that Hill did not hear (or see) the headshot.
Muchmore shows that Hill is looking straight at jfk or at least at the back of the jfklimo at Z313, ie when level with the left front wheel of Queen Mary.
And, it was Kellerman that told us that Oswald's shot-1 hit jfk at say pseudo Z105, koz Kellerman heard jfk say my god i am hit (bits of lead from the ricochet off the overhead signals hit jfk in the top right of his head)(seen in xray in galea).
Also, strange that Kellerman admitted that there had been a flurry of shots -- but a day or 2 after the shooting Kellerman & Co were not sure what info would surface, so, they hedged their testimonys, just in case Hickey's firing surfaced, they did not want to obviously look like complete liars.