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Guest
Control of the gun is imperative, both hands should be used if possible. As far as edged weapons are concerned, here goes. The Calibre Press (Charles Remsberg & Dennis Anderson) started hosting Police Survival Seminars for law enforcement personal in the 80's. They have also published several books. They had a extremely professional staff and researched edged weapons thoroughly. Their expert consultant & adviser was Dan Inosanto. Five years of research went into those, both police and civillian, who survived edged weapon attacks (some were trained, some weren't). Their conclusion was 'undisputed' that those who survived had control of the knife weilding arm or hand. They put this concept together with an acronym-G.U.N., meaning Grab-Undo-Neutralize.
I think we all agree with you in getting and maintaining control. It is always good to get the perspective of someone on the force. I agree with these concepts, but they may get you only half way there. Putting two hands (or one hand) on a gun will have the attacker do what? - put his other hand on the gun. And you have a wrestling match for control of the gun, which the attacker established before you did. You have a 50/50 chance (maybe less) of getting it away from the attacker by just trying to manipulate it away. What I am saying is don't forget you have feet to kick out their foundation, and an extra hand you can use to strike. These things help the odds of getting a gun away.
It is important to establish control and disarm if you can. What you use to accomplish this will vary with the strength and determination of the attacker.