Creative Speculation

No one claims that all shots came from the front. Obviously Kennedy was struck in the back and Connally was hit by a bullet also from behind the limo. Most of the spectators were standing closer to the TSBD (and Dal-Tex) than the knoll area. So the "ear-witness" thing, in context, states the obvious and does in no way account for why the witnesses were drawn to that area.

Your criticism of Fiester is rather limited. She uses the gelatin block footage to expand her point on the transfer of kinetic energy, but her discussion of the JFK shot is one of a tangential shot which is different. Most witnesses after the shooting described a large hole in the right rear of Kennedy's head. Blood and brain matter ejected forcefully towards the rear of the limo. The "jet effect" explanation was made up expressly for this case, and holds no validity except in the arguments of supporters of the official story.

The forward movement of Kennedy in the Zapruder film is not visible when the film is played, but the forceful lurch back into his seat is - and the point which was originally being made is that by 3 PM Dallas time the investigating authorities knew: a) witnesses stated that shots came from the knoll b) eyewitnesses were drawn in numbers to that area immediately after the shots c) JFK's reactions strongly suggest a shot from the front. And yet, there is no evidence that a gunman situated in the front was ever considered by the investigating authorities, rather it would be quickly determined that the assassination was the result of a single shooter with no associates.