For David.....
Jarman and Norman departing for the 5th floor.
Mr. BALL - The sidewalk in front of the Texas School Book Depository Building?
Mr. JARMAN - Yes, sir.
Mr. BALL - How long did you stand there?
Mr. JARMAN - Well, until about 12:20, between 12:20 and 12:25.
BALL. Did you stay there?
Mr. NORMAN. Well, we stayed there I believe until we got the news that the motorcade was coming down, let's see, is that Commerce, no Main, because Commerce- we went back in the building, James Jarman and I.
A timeline of the Presidential Motorcade with taken from Dallas Police Radio suggests Motorcade got to Main about 12.24pm.
What do you base your belief that those two arrived on the 5th floor before 12.15 pm on?