But Norman didn't go "click-click-boom-click-click-boom-click-click-boom-click-click".
Thats right, John. Harold Norman heard NO clak clak boom or any other noise right over his head on the 6th floor SN from 12:25 until 12:30 approximately when shots were fired, of which he replicated those in every one of his video interviews with the boom, clak clak, repeated 3 times and if you time that, he completes the sequence in about 4 seconds or less.
Certainly NOT anywhere NEAR to the 8.3 sec spacing as proposed by my LN friends such as above who suggest the 1st shot fired at 160 or Z170 because of Jackie turning her head rapidly and JFK waving turning his head also.
IMO, Harold Norman did not misnterpret that waving the hand as "slumping" I think he actually means the REAL slump that occurs just after JFK is struck about Z223.