It is interesting that Connally did not recall hearing the shot that hit him, as he describes the shots he did hear as being "very loud" and that he immediately recognised them as rifle shots:
"I heard what I thought was a shot. I heard this noise which I immediately took to be a rifle shot."
"...once I heard the shot in my own mind I identified it as a rifle shot,"
Equally, he is certain about the headshot:
"...the third shot sounded, and I heard the shot very clearly."
"It was a very loud noise, just that audible, very clear."
When asked about the time gap between hearing the first shot and when he was hit by the second shot, it is clear he is describing a "split second", that is to say, a time gap of less than one second.
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. These were just thoughts that went through my mind because of the rapidity of these two, of the first shot plus the blow that I took, and I knew I had been hit, and I immediately assumed, because of the amount of blood, and in fact, that it had obviously passed through my chest. that I had probably been fatally hit."
When asked about the time between the first and third shots he said it was a "very brief span of time", 10-12 seconds (4H134):
Mr. SPECTER. What is your best estimate as to the time span between the first
shot which you heard and the shot which you heretofore characterized as the
third shot?
Governor CONNALLY. It was a
very brief span of time; oh, I would have to
say a matter of seconds. I don’t know. 10, 12 seconds. It was extremely rapid,
so much so that again I thought that whoever was firing must be firing with an
automatic rifle because of the rapidity of the shots ; a
very short period of time.
So, the question is if a "very brief span of time" is 10-12 seconds in JBC"s mind, how much is a "very, very brief span of time"?