There are also some who believe that it was the first two shots that were closer together, though not as many who recall it being the last two that were bunched together.
At Saturday night NPIC briefing board preparation, Dino Brugioni said the secret service was particularly interested in the frames near when JFK disappeared and reappeared from behind the sign. No, the film was not altered and I don’t believe NPIC had the original film which was still in Chicago and probably damaged by that time.
The truth is not subject to majority rule. Although there is no definitive proof of when the first shot was taken, I firmly believe the preponderance of evidence is that it was fired in the Z147-148 window which would mean there were about 4 seconds between the first and second shots and about 5 seconds between the second and third shots. What muddies the water is that a single shot can produce multiple sounds and those sounds for the third shot would seem to be right on top of each other. Because the bullet traveled at roughly twice the speed of sound, witnesses near the limo would hear those other sounds before they heard the muzzle blast from the sniper's nest. The impact on JFK's skull, the mini-sonic boom of a bullet passing over their heads, the impact on the windshield frame would all produce sounds that would reach the ears of the nearby witnesses before the muzzle blast.
