It would seem manifesto fails to understand that the speed of the splatter is only a function of impact speed as it relates to
a. The energy of the impacting bullet
b. the droplet size of the blood splatter
The smaller the droplet size, the lower its mass per frontal area, the more it is affected by air resistance. This is why a football goal kicker can kick a football, say, 45 yards, but if he tries to kick a ping-pong ball, it will only go a few feet no matter how hard he kicks it. The consequence of this is that when impact velocity climbs, the resulting movement of anything that is hit (such as blood splatter) does not increase at a proportional rate; its hits a pressure wall when approaching supersonic speeds.
We can reference this all back to the evidence that manifesto has posted in support of this claim, which is that JFK was 'shot from somewhere in front of him, and that the bullet was a soft point from a hunting rifle'
Sure, the abstract that manifesto posted, which shows that blood splatter can be faster than the impacting projectile, is correct, at low velocities. A heavy projectile striking a pool of blood at 1.55 m/s can cause splatter to eject faster than its impact velocity (in the example 3.59 times faster). However, as the velocity of the projectile increases, the speed of the splatter does not increase in proportion. As an analogy, a typical amateur golfer can swing the club head of a No 1 Wood (Driver) at around 95 mph, however, if you tee him up a blood soaked sponge to hit, the resulting splattered blood droplets are not going to be travelling at 340 mph. They may initially travel at close to or over 95mph, but not for very long.
When we get to the blood soaked sponge YT video manifesto posted, the splatter might be very fast (although I disagree with his contention that it is faster than the incoming bullet). However, the bullet used for this test is .22 cal, so its velocity will be less than 1150 fps. A soft point bullet from a hunting rifle will be incoming at over 2500 fps... a totally different story.
manifesto's whole ratioanle for this absurd line of reasoning is that he desperately wants the bullet to still be in Z313 (therefore in JFK's head when the front-right of his head explodes) so that he can claim the bullet passing through is the force acting to accelerate JFK's head "back and to the left". It ain't gonna happen; this contention is, simply put, a ballistic, scientific and physical impossibility. Even if the initial egress of blood droplets (the first few millimetres) is very fast, it WILL be subsonic, and therefore, at most, less then half the velocity of the bullet. Air resistance will decelerate these droplets quickly and dramatically, and by the time we SEE that large misty cloud of splatter, the bullet has moved on and is hundreds of feet away.
Further, even the contention that JFK's head movement "back and to the left" could have been the result of a bullet from the front right is utterly flawed, and only happens in Hollywood ballistics. Here in the real world, it simply DOES NOT HAPPEN as amply demonstrated by the videos and photographs posted by BStrong. I have shot enough deer, goats, thar and chamois when hunting to know that even when you shoot an animal with a kill shot to the head, the animal drops right there on the spot, sometimes literally falling straight down into its own stance. I do recall once, a chamois' head jerking back violently when I hit it with a headshot, but since I shot it from about the 8 o'clock position (6 o'clock being directly behind) it wasn't the result of anyone else shooting from in front - there are no stockade fences or triple underpasses in Arthur's Pass National Park, and although there are a lot of grassy knolls, none of theme were hiding second hunters.
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