Not only that, Norman said that the test day was a lot noisier outside than the day of the actual event.
Too bad Norman could not tell the same story twice. First statement on 11/26, no mention of the sound of the bolt or shells. The big question is did he stick his head out of the window between the shots or didn't he? Apparently he even heard the bolt and shells when his head was outside of the window. I bet the WC members did not try that. Did the dust fall into his eyes from the ceiling or when he was looking up outside of the building?
FBI 11/26: "He stated that about the time the car in which the President was riding turned on to Elm Street, he heard a shot. He said he thought the shot had been fired from the floor directly above him. He further stated at that time he stuck his head from the window and looked upward toward the roof but could see nothing because small particles of dirt were falling from above him. He stated two additional shots were fired after he had puled his head back in from the window."
Secret Service 12/4: Now he adds the bolt and shells but not his head outside of the window. "I knew that the shots had come from directly above me, and I could hear the expended cartridges fall to the floor. I could also hear the bolt action of the rifle. I also saw some dust fall from the ceiling of the fifth floor and I felt sure that whoever had fired the shots was directly above me.