I came across an FBI report of an interview of JBC made by SA H.T. Burk at St. David's hospital on December 11, 1963. While it is generally consistent with JBC's WC testimony it provides additional details and presents a slightly different light on what Connally did and observed after the first shot and before he felt the impact of the bullet that hit him in the torso. It is marked as CR-188 in file SA 89-67 and is part of the collection titled: " Warren Commission Records Related to Key Persons". It is also hand marked "JBC-1" at the top. It is available on the Mary Ferrell site at
this URL. Here is the important part:

He says he turned to his right "to look back" and "sensed more than I saw, that President Kennedy had been hit." He says that he then turned back to the left "a little" before being hit himself.
One interesting comment is on page 3:

It is clear from this that JBC turned around enough to see three buildings, which he identified as the TSBD, a middle one and the County Records building. Unless he had eyes in the back of his head, I don't see how he could be referring to this turn:
