Creative Speculation
In reply to the discussion: Here's a correction OP for 50 Reasons, 50 Years OP [View all]arguille
(60 posts)This is from Chapter 7 of Sherry Fiester's book "Enemy Of The Truth: Myths, Forensics, and the Kennedy Assassination". It answers ZombieHorde's inquiries, and provides a rejoinder to "Wm Seger"'s two frame GIF and multiple postings on the "real physics" of the head shot.
First two quotes are from Karger, Bernd. (2008). Forensic Ballistics. In Tsokos, Michael (Ed.), Forensic Pathology Reviews (Vol. 5). New Jersey: Humana Press.
When the bullet strikes the skull, the velocity abruptly slows, thereby transferring kinetic energy to the target. This primary transfer of energy causes the target to move minutely into the force and against the line of fire, quickly followed by movement with the force, and in the continued direction, of the moving bullet (Karger, 2008).
Velocity and mass determine the bullets kinetic energy, and the wounding potential relies on the efficient transfer of that kinetic energy to tissues. Pressure builds, and as the projectile navigates the head, there are only the entrance wound and any consequent fractures for release of that pressure. Therefore, within three to five milliseconds blood is expelled out of the hole from which the bullet entered as back spatter (Karger, 2008).
Blood spatter from gunshot wounds are divided into two categories, forward spatter and backspatter. Forward spatter ejected from the exit wound and travels in the same direction as the bullet. Backspatter ejected from the entrance wound travels against the line of fire, back towards the shooter
The prominent blood spatter pattern in Zapruder Frame 313 corresponds in every measurable manner with back spatter. The blood observed in the Zapruder film displays the pattern shape of back spatter. It also extends from the wound area a distance that is characteristic of back spatter. The timing for the pattern creation and the dissipation rate identifies it as back spatter. In fact, all available information concerning the blood spatter pattern in the Zapruder film corresponds in every measurable manner with back spatter replicated in forensic laboratories and described in peer-reviewed publications since the late 1980s. (Fiester)
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