Dino Brugioni claimed that he had seen a different version of the Zapruder film which included a large red mist over JFKs head, which lasted 2 to 3 frames, at the time of the fatal head shot. The Zapruder film as it stands only shows a red mist for 1 frame which is frame 313. Brugioni claimed that the version of the Zapruder film we have now shows a much shorter headshot sequence than the version he saw.
However Abraham Zapruder disproves such a claim. When Zapruder sold the rights of the Zapruder film to LIFE magazine, he stipulated that frame 313 must never be published, a stipulation that LIFE honored. The fact that Zapruder stipulated that only 1 frame must not be published, and not 2-3 frames, is prima facia evidence that the gore of the headshot did not last longer than 1 frame.