Here's a correction OP for 50 Reasons, 50 Years OP

[William Seger]

46. Neither you nor Fiester have refuted what I'm saying about Zapruder

In the text I linked to, Feister says the videos demonstrate that the gelatin bulges slightly in the direction the bullet came from, but that's completely irrelevant to what I'm talking about. What I'm challenging you to refute is that there was a forward movement of the entire head, measured at 2.5 inches and thoroughly analyzed with real physics, immediately after the bullet has passed completely through. I'm challenging you to refute that this displacement implies that either the shot was from behind or the film has been altered.

And again, whatever caused the back-and-to-the-left movement, it cannot have been momentum from the bullet because that movement began three frames, 1/6 second, after the bullet had already passed through the head and is no longer applying any force. Furthermore, that motion shows acceleration for several frames which implies a continued force. I personally believe it was a muscle spasm rather than the jet effect, but it certainly wasn't the bullet.

And again, I see nothing in your response or what I could find by Fiester that even addresses any of those issues, much less refutes the physics involved.

Hearsay about a left-rear exit wound is not supported by any hard evidence, and it's not supported by the Zapruder film. (And no, it wasn't just "painted over.&quot

And yes, the forward head-snap is quite visible when you know it's there. I don't believe you tried very hard.