From that 6th Floor sniper's nest, it would take a "Drastic" angled shot Downward through the Half Open window to strike the signal arm. This was displayed in "The Lost Bullet" DVD. No question.
My calculation of Oswald's angles based on below is .....
shot-1 at Z113 is -34.8 deg. If at Holland's Z106 it is still -34.6 deg koz either way it is at the signals.
shot-2 at Z218 is -21.0 deg.
shot-3 at Z312 is -16.6 deg.
Here are the timings for Oswald's shot-1 & shot-2 & for a faux shot-3.87 ft is the horizontal dist scaled by me, 106 ft is the hypotenuse dist allowing for vertical dist estimated by me.
Oswald Shot ----------- hit at ------ fired at ------ sound hit JFK at – Carcano = 2170 ft per sec.
1 --- 87 ft = 106 ft ----- Z113 ------ Z112.1 ---------- Z113.9 ----- camera runs at 18.3 frames per sec.
2 --- 184 ft = 197 ft---- Z218 ------- Z216.3 --------- Z219.6
3 --- 255 ft = 266 ft ---- Z313 -------- Z310.8 --------- Z315.2 -------- Oswald did not have a shot-3.
The time tween shot-1 & shot-2 is 104.2 frames, which is 5.7 sec. Holland reckoned that shot-1 was at Z106, which is an extra 7 frames, or 0.4 sec, which makes it 6.1 sec.
The time tween shot-2 & faux shot-3 is 94.5 frames, which is 5.2 sec.
Adding to 10.9 sec.
Here are the timings for Hickey's auto burst, based on there being 6 shots.Hickey Shot ------------- hit at ------ fired at ------ sound hit JFK at -------
6 ---- 26 ft---------------- Z313 -------- Z312.8 ---------- Z313.2 --- hit JFK in head & cracked windshield.
5 ---- AR15 = 3250 ft per sec------------ Z310.0 ---------- hit chrome trim on windshield.
4 ---- sound = 1100 ft per sec ----------- Z307.25 -------- went over the windshield, hit Elm St.
3 ---- probly 400 rpm= 6.67 rps --------- Z304.5 ---------- went over the windshield, hit Elm St.
2 ------------------------------------------- Z301.8 ----------- went over the windshield, hit Elm St.
1 ------------------------------------------- Z299.0 ---- probly hit Main St pavement & then kerb near Tague.