The memo is about the fragments removed from Connally. I posted it as an example of an FBI agent referring to bullet fragments as a bullet. If you were familiar with the subject, you wouldn't have ended up with your foot in your mouth.

I officiated high school and college football for over 25 years. I think I know what the official clock is and it's the clock on the primary scoreboard. You obviously misunderstood what the explanation was by the Big 10. The issue is with how the replay cameras are synced to the stadium clock. All the video cameras are supposed to be synced to the stadium clock before the game. There is a technical problem that causes the main TV camera that superimposes the first down line on the screen to fall about quarter second behind the other cameras. That's why the main camera showed the clock hit 0:00 before the pass was touched out of bounds while the end zone camera showed there was still 0:01 second on the stadium clock when the ball was touched. While the end zone camera was probably the more accurate one, the replay protocol dictates that the main broadcast camera is the one that should be used when determining timing issues such as this. The reason for that is obvious. The main camera is the one everybody looks at. Had they followed the protocol, they would have made the ruling based on what the main camera showed. Nobody would have ever known what the camera in the replay booth showed and there would be no controversy. The ruling on the field that the game clock had run out during the first Hail Mary would have stood and Western Michigan would have the victory.

The NFL has a protocol that says even if replay shows the play ended with one second still on the clock, they do not put time back on the clock. If it's that close, the call on the field stands and the game is declared over. If there isn't at least a two second error, the play stands as called on the field.

Thanks for some useful information. So if I’m understanding correct  a Z313 fragment could have had a velocity as high as 800 ft/ sec and still strike the curb if the fragments angle after exit from JFK skull was much more upward than the minimum angle required to go above the windshield.

Only question I have is how probable it is that  a fragment  deflects upward more than 45 degree after exiting the skull in order to have a steeper parabolic arc that shortens the horizontal distance traveled to coincide hitting the curb at the 800 ft/sec more  vertical strike angle of 45 degree or greater?

If it’s reasonable probable a fragment could deflect upward more than 45 degree upon exiting the skull at 800 ft/sec then I think the problem is finally solved.