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It's about inertia. Several things can induce that problem. One is not holding the pistol tightly. Another is allowing the arm to come back with the gun. A too-light gun can also be a factor. If the gun is light (as a Glock is) the required inertia has to come from someplace else, like heavy arms or hands or muscle resistance. Sometimes a person firing a Glock .45 will experience malfunctions that he will not experience with a heavier Model 1911 type steel pistol.
As to twisting, a pistol will twist in the direction of the rifling twist. That can be resisted, but there is usually no point in doing so. Normal recoil is always around the center of gravity of the pistol/hand system. Recoil begins when the bullet begins to move, and is straight back in line with the barrel. But the CG of the pistol is below the line of the barrel, so the pistol tries to pivot around its CG, which means its butt goes down and its muzzle up.
It is obvious to me that the shooter is not gripping the pistol very tightly and/or has small, light hands and arms. Since the mass of the arms and hands is not easily increased, a tighter grip and "pushing" the pistol forward would probably solve the problem.
Jim
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