I literally punch a hole in the tail or draw rope throgh the jaw bone and hang them from a tree and use a machete to hack off the armor, center of spine first, then pliers and fillet knife to attempt to pull off the armored sides. They are dead when they are getting in the boat thanks to a lead pipe. I'm talking 5-6.5 ft alligator garfish caught in Cameron/rollover.
Trying to re-invent the wheel, eh?
Negative the hanging from the tree puts good tension on the fish when hacking with the machete, AND keeps your got danged hand away from the blade. A lot more safer than the technique featured in the video. Machete + swinging towards hand/fingers = pas Bon.