Pertaining to the Dorothy Garner time line of exiting the 4th floor office side door and having an unobstructed LOS to the rear stair, I estimated the time not later than 35 sec post shots.
1. Adams and Styles did leave the office as early as 10 sec post shots (hence their absence at the one open window of 4th floor in the Dillard photo) and reached the 1st floor, using the rear staircase by 60 secs post shots. They exited 1st floor via a roll up door right beside the stairs and the west elevator. Thus they neither saw, or were seen by,Baker and Truly as B/T began their diagonal approach across the 1st floor towards the rear stair and elevators at approx 65 sec post shots
2. For Mrs Garner to have a reasonable probability of having heard.”THEM” (ie; voices or some kind of specific noise like heels clacking,) , requires Mrs Garner arriving to the west window 4th floor just beside the rear staircase not later than approx 50 sec post shots.
The noises/voices heard were possibly transmitted via the open west elevator shaft ( the elevator being locked on the 5th floor) from Adams and Styles on the 2nd floor , passing by the elevator shaft.
Note: it is doubtful if voices at normal talking decibel range ( as opposed to shouting like Truly did) could be transmitted up an elevator shaft 4 floors below and heard by Garner some 25 ft away from the shaft on the 4th floor.
3.Therefore the lowest probable floor to have voice transmission heard is the 2nd floor passing by the west elevator shaft at 50 sec post shots by Adams and Styles
4. The distance from the 4th floor side office door to the staircase is approx 70 ft and if Mrs Garner walked at a normal 5ft/ sec pace, she would have her to exit at 35sec post shots to arrive and be in place near the stair by 50 sec post shots
5. It is impossible for Oswald to have reached the 4th floor landing in 35 secs, let alone cross 15 more ft landing and also go down approx 1/4th so being completely out of LOS of
6.Oswald at best could reach the 4th floor landing, cross it, and go down part of the 4th to 3rd staircase not earlier than approx 60 secs shots
A. 5 secs to slowly withdraw rifle from
SE window 6th floor TSBD and exit the SN
B.25 sec travel 180ft at double time speed 8ft/ sec ( 3 secs added for acceleration and acceleration to full
Stop.
C.5 sec to wedge rifle into the gap between walls of boxes with only 1”gap
D. 5 sec travel to top step of staircase To begin descent from 6th floor
E. This at 40 sec post shots, earliest probable time to begin a descent down the staircase.
F. Fastest probable descent via 18 step staircase and 15 to 20 ft of landing distance is approx 10 sec/ floor= 60 sec to reach 4th floor, cross landing and begin down staircase to 3rd floor.
Note: above times do NOT include any time for wiping prints off the rifle this a question if such wiping could occur Simultaneously while running with rifle in hand. If that is improbable then about 5-7 more secs must be added.
7. If Mrs Garner waits until 60 secs posts shots before exiting the 4th floor office door, she would have arrived near the staircase at 73 seconds , thus impossible to have heard Adams and Styles voices/heels clacking or whatever it was they made Garner decide she did in fact hear “THEM” on the staircase, The reason being that Adams and Styles are OUT OF THE BUILDING by 65 sec post shots!
If Mrs Garner is still alive ? It would be a slam dunk end to the WC timeline if she should categorically state having heard Adams and Stylez voices or some specific noise such as double pair of heels clacking.