The video you're referring to was a professional shooter using a Glock with light springs. He was using only inertia to cycle the slide and was not hooking it on anything. It spurred a whole lot of people to try to learn to do it. I don't think anyone else did it with a gun that was not sprung extremely lightly like his was. If you really need to pull a gun you will not have time to rack it first (even using inertia to rack it). Fractions of a second will make a difference in an emergency situation.
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