The Muchmore frame on the left is 2 frames after the headshot and the right frame is the next frame after, which shows the crack.
The Muchmore frame before the headshot.
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This first frame is Zapruder 255 which is Altgens 6 and thereafter are the next sequential frames.
Spot the crack?
These frames come from the
"JFK Assassination Research Photo Gallery" link at the top of the page.
JohnM