Oswald in the doorway: the blog of the Oswald Innocence Campaign, by Ralph Cinque

Clint Hill had a more honest nature than Emory Roberts:

Mr. SPECTER. Now, what is your best estimate of the speed of the President's automobile as it turned left off of Houston onto Elm Street?
Mr. HILL. We were running still 12 to 15 miles per hour, but in the curve I believe we slowed down maybe to 10, maybe to 9.
Mr. SPECTER. How far back of the President's automobile was the Presidential followup car when the President's followup car had just straightened out on Elm Street?
Mr. HILL. Approximately 5 feet. 

So, Hill pegged the speed at 10mph or less and the distance at 5 feet. 

His account is simple, but not accurate. He claimed to hear the first sound (and again with the firecracker bull shit; all these seasoned agents mistook a gunshot for a firecracker) and he immediately jumped from the car and raced to the limo:

Mr. SPECTER. Now, as the motorcade proceeded at that point, tell us what happened.
Mr. HILL. Well, as we came out of the curve, and began to straighten up, I was viewing the area which looked to be a park. There were people scattered throughout the entire park. And I heard a noise from my right rear, which to me seemed to be a firecracker. I immediately looked to my right and, in so doing, my eyes had to cross the Presidential limousine and I saw President Kennedy grab at himself and lurch forward and to the left.
Mr. SPECTER. Why don't you just proceed, in narrative form, to tell us?
Representative BOGGS. This was the first shot?
Mr. HILL. This is the first sound that I heard; yes, sir. I jumped from the car, realizing that something was wrong, ran to the Presidential limousine. Just about as I reached it, there was another sound, which was different than the first sound. I think I described it in my statement as though someone was shooting a revolver into a hard object--it seemed to have some type of an echo. I put my right foot, I believe it was, on the left rear step of the automobile, and I had a hold of the handgrip with my hand, when the car lurched forward. I lost my footing and I had to run about three or four more steps before I could get back up in the car.
Between the time I originally grabbed the handhold and until I was up on the car, Mrs. Kennedy--the second noise that I heard had removed a portion of the President's head, and he had slumped noticeably to his left. Mrs. Kennedy had jumped up from the seat and was, it appeared to me, reaching for something coming off the right rear bumper of the car, the right rear tail, when she noticed that I was trying to climb on the car. She turned toward me and I grabbed her and put her back in the back seat, crawled up on top of the back seat and lay there.

You didn't, Clint. This is you, standing cool as a cucumber on the floorboard, and at this point at least 3 shots had been fired. After 3 shots, you hadn't budged.

And even according to Officialdom, after 2 shots, you hadn't budged. You look very, very planted there, buddy. You weren't on the verge of going anywhere. You weren't even paying attention to the Kennedys. You were looking at Emory Roberts talking on the phone. Why didn't you tell us about that? And, it was after at least 3 shots because the Single Bullet Theory is crap.