If that's true, U tell us if the 3rd loud noise was a backfire or a firecracker
The 3rd loud noise was the flurry of Hickey's accidental auto burst of his AR15, plus echoes. Here is my own idea of the shot sequence for Oswald's two shots & Hickey's say 6 shots.
Shot-1 (which ricocheted offa the signal arm) was at about Z103 (Holland) or about Z113 (me). Anyhow it was when JFK was in line with the signal arm (from Oswald's carcano).
Shot-2 was at Z218 (me)(the magic bullet).
If Hickey fired 6 shots (he fired at least 4).
Shot-3 (Hickey's AR15) was at Z298 (bloodied Tague)(modern AR15s can fire at 1200 rpm, but Hickey's AR15-601 probly fired at 400 rpm).
Shot-4-5-6 hit tarmac & kerb & grass at Z301-304-307.
Shot-7 at Z310 hit the chrome trim of the jfklimo windshield above the mirror.
Shot-8 hit JFK in the head at Z313, & the remnant slug cracked the windshield glass left of the mirror.