It's in the link, Bill.
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We simply do not know how a body reacts to shots to the head, Bill. I choose to believe that a frontal shot pushed his head backward and people down on the street ran up to the knoll area. They didn't do that because they were sight seeing. *Something* made them run up there.
Again, a shot from the right-front does not throw the head and body violently back and to the left.
The link you provided stated the following...
"The committee believes, on the basis of the evidence available to it, that President John F. Kennedy was probably assassinated as a result of a conspiracy. The committee is unable to identify the other gunman or the extent of the conspiracy."The HSCA had no idea what sort of conspiracy existed, if any at all.
This doesn't even mention their faulty conclusion based on the supposed rifle fire caught on the dictabelt recording, even though the impulses were recorded once the motorcade was on it's way to Parkland Hospital.
You wish to claim that the HSCA "got it right", yet you claim, based on your opinion on the way the body went back and to the left, that the President was struck by a shot from the knoll. The HSCA stated that the President was struck twice, both from behind and both from above. it sounds like you're contradicting yourself.