CLINT HILL: I saw the president grab at his throat and move to his left, and I knew something was wrong. And so that's when I jumped from my position and began ... to try and get up on the top of the back of it to form a shield there behind President and Mrs. Kennedy so no further damage could be done.

CLINT HILL: Well, the crowd had really grown. It was very large. They couldn't be contained on a sidewalk. They were 15 to 20 deep on each side of the street.

SCOTT PELLEY: What are you watching as the cars go through those crowds?

CLINT HILL: Anybody that's out of the ordinary, that stands out, that isn't dressed like everybody else, that just appears different. Those are the kinds of things we have to make note of.

SCOTT PELLEY: As the motorcade turns onto Dealey Plaza what are you seeing?

CLINT HILL: Immediately in front of us was the Texas Schoolbook Depository. ... We didn't see anything unusual at all ... and then when we just started to straighten out and started to gain up little bit more speed was when I heard an explosive noise over my right shoulder.

The four agents on the follow-up car snapped their heads toward the noise. The two on the right side, assigned to cover the president, now looked away from the limousine. But as Hill turned, his view crossed the president's car.

CLINT HILL: I saw the president grab at his throat and move to his left, and I knew something was wrong. And so that's when I jumped from my position and began ... to try and get up on the top of the back of it to form a shield there behind President and Mrs. Kennedy so no further damage could be done.

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