Another choice. It is when JBC first realizes he has been hit. Reagan did not know he had been shot until he was on his way to the hospital. The bullet was a half of an inch from his heart. Also remember JBC never heard a third shot. Both Nellie and Jackie place it before a second shot.
Just to clarify - JBC doesn't hear the bullet that hits him. He assumes it's a second shot as he distinctly remembers hearing a first shot, which he is confident didn't hit him, so assumes there must have been a second shot that he didn't hear.
I think this is a really important point particularly as, like many witnesses, he describes the sound of the shots as being "very loud" -
"It was a very loud noise, just that audible, very clear."I'm sure there are theories why JBC would hear the first shot and not hear the shot that struck him but I'm unaware of them. I've no doubt it's the usual baloney.
It is also important to note the emphasis that JBC puts on the time difference between hearing the first shot and being aware he himself is shot -
Mr. SPECTER. What is the best estimate that you have as to the time span between the sound of the first shot and the feeling of someone hitting you in the back which you just described?
Governor CONNALLY. A very, very brief span of time. Again my trend of thought just happened to be, I suppose along this line, I immediately thought that this--that I had been shot. I knew it when I just looked down and I was covered with blood, and the thought immediately passed through my mind that there were either two or three people involved or more in this or someone was shooting with an automatic rifle.
JBC, a man seemingly familiar with guns and rifles, describes the gap in time between hearing the first shot and being aware that he is hit, as similar to the time gap between the shots of an automatic rifle. Is this less than one second? - a "very, very brief span of time."
The following is lifted from the Pat Speers website -
(12-13-63 FBI report on a 12-11 interview, CD188, p. 3-5) "When Governor Connally was asked about the elapsed time between the first and last shot he remarked “Fast, my God it was fast.
It seemed like a split second. Just that quick” and he snapped his fingers three times rapidly to illustrate the time and said “unbelievably quick…"
It seems highly probable that the first shot heard by JBC hit him and that he didn't become consciously aware of being shot for a "split second". Indeed, if z234 represents the moment he first became aware of being shot I would argue he is responding to being hit 0.6 seconds earlier - literally a split second. JBC is constantly emphasising this "unbelievably quick" gap between the two events and we can say with some certainty that two initial shots fired so close together didn't actually happen.
I would argue JBC is shot at z223 and becomes aware of it @ z234
It may be no more than coincidence but Connally is asked to mark on a survey plat of Dealey Plaza where he thought the limo was at the time of the first shot. Pat Speer produced the following graphic to illustrate JBC's choice (the blue circle):