Note that Sims and Boyd were accompanying Fritz.
Mr. BALL. Did you go directly to a building?
Mr. FRITZ. Directly to the Texas School Book Depository Building.
Mr. BALL. What time did you arrive there?
Mr. FRITZ. Well, sir; we arrived there---we arrived at the hospital at 12:45, if you want that time, and at the scene of the offense at 12:58.
Mr. BALL. 12:58; the Texas School Book Depository Building.
Mr. FRITZ. After I arrived one of the officers asked me if I would like to have the building sealed and I told him I would.
Mr. BALL. What officer was that?
Mr. FRITZ. That is a uniformed officer, but I don't know what his name was, he was outside, of course, I went upstairs and I don't know whether he did because I couldn't watch him.
Mr. BALL. Then what did you do?
Mr. FRITZ. We began searching the floors, looking for anyone with a gun or looked suspicious, and we searched through hurriedly through most all the floors.
Mr. McCLOY. Which floor did you start with?
Mr. FRITZ. We started at the bottom; yes, sir. And, of course, and I think we went up probably to the top.
Different people would call me when they would find something that looked like something I should know about and I ran back and forth from floor to floor as we were searching, and it wasn't very long until someone called me (likely Gerald Hill) and told me they wanted me to come to the front window, the corner window, they had found some empty cartridges.
Mr. BALL. That was on the sixth floor?
Mr. FRITZ. That is right; the sixth floor, corner window.
Mr. BALL. What did you do?
Mr. FRITZ. I told them not to move the cartridges, not to touch anything until we could get the crime lab to take pictures of them just as they were lying there and I left an officer assigned there to see that that was done, and the crime lab came almost immediately, and took pictures, and dusted the shelfs for prints.
So it seems that Fritz did not hear Mooney's call. Fritz and his men went inside and began searching thebuilding for a gunman. Only later was he informed of the discovery of the shells. This would explain the six minute or so time gap between the SN discovery and the arrival of Fritz in that location. Hill testified he talked to Fritz about the SN discovery and so I have added that in bold to Fritz's testimony.