then felt the delayed reaction of the impact on his back, later heard the shot which shattered the President's head, and then lost consciousness without hearing a third shot which might have occurred later.
The Second Shot
The possibility that the second shot missed is consistent with the elapsed time between the two shots that hit their mark. From the timing evidenced by the Zapruder films, there was an interval of from 4.8 to 5.6 seconds between the shot which .struck President Kennedy's neck (between frames 210 to 225) and the shot which struck his head at frame 813.346 Since a minimum of 2.3 seconds must elapse between shots, a bullet could have been fired from the rifle and missed during this interval.347 This possibility was buttressed by the testimony of witnesses who claimed that the shots were evenly spaced, since a second shot occurring within an interval of approximately 5 seconds would have to be almost exactly midway in this period. If Altgens' recollection is correct that he snapped his picture at the same moment as he heard a shot, then it is possible that he heard a second shot which missed, since a shot fired 2.3 seconds before he took his picture at frame 255 could have hit the President at about frame 213. On the other hand, a substantial majority of the witnesses stated that the shots were not evenly spaced. Most witnesses recalled that the second and third shots were bunched together, although some believed that it was the first and second which were bunched.348 To the extent that reliance can be placed on recollection of witnesses as to the spacing of the shots, the testimony that the shots were not evenly spaced would militate against a second shot missing. Another factor arguing against the second shot missing is that the gunman would have been shooting at very near the minimum allowable time to have fired the three shots within 4.8 to 5.6 seconds, although it was entirely possible for him to have done so. (See ch. IV, pp. 188-194.)
The Third Shot
The last possibility, of course, is that it was the third shot which missed. This conclusion conforms most easily with the probability that the assassin would most likely have missed the farthest shot, particularly since there was an acceleration of the automobile after the shot which struck the President's head. The limousine also changed direction by following the curve to the right, whereas previously it had been proceeding in almost a straight line with a rifle protruding from the sixth-floor window of the Depository Building.
One must consider, however, the testimony of the witnesses who described the head shot as the concluding event in the assassination sequence. Illustrative is the testimony of Associated Press photographer Altgens, who had an excellent vantage point near the President's car. He recalled that the shot which hit the President's head "was the last shot--that much I will say with a great degree