You must have looked up at that window, the Texas book depository, but you didn't react.
7 seconds sound clip from the In the Line of Fire movie soundboard.
You can hear this line at 00:25:27 in the Blu-ray version of the movie.
Quote context
[...]
- Dallas. That morning at Love Field.
- You all look so radiant. JFK, Jackie and you.
- You look so young and able, Frank.
- What did happen to you that day?
- Only one agent reacted to the gun fire and you were closer to Kennedy than he was.
- You must have looked up at that window, the Texas book depository, but you didn't react.
- Do you wish you'd succeeded, Frank? or is life too precious?
[...]