You're under some sort of flawed assumption that the idea is "take the knife from the opponent, place it on the ground, and then taunt him."
Not sure where you got that idea. To be clear, my ideal is that I take the weapon from them, and then use it against them. If it does go flying across the room, I am going after it or another weapon of opportunity. (it also means I failed part of my disarm... I really don't want the weapon flying... I want to be the one with the weapon... I don't want it flying off and hurting an innocent bystander... or being picked up by the guys buddy)
If you are between your enemy and the weapon, he is either going to have to dance around you or go through you.
My bet is that he has an adrenaline rush, and plows right through you, to the weapon.
If the weapon is away from you (especially a knife) that gives you a chance to run while he's going to get it.
If its a gun, you better be really fast at running.... bullets are not slow. If it is a knife, it depends on how fast you can run verses him. At that point it becomes a weapon of opportunity... I get the closest weapon I can get.
but the thing is if you get the weapon away from your attacker, it's not something he's going to immediately have access to
But there is a very good chance, your attacker will be extremely focused on getting that weapon back, whether its behind you (he is charging through you), it's across the room (he will get there first) or in your hand (he will charge you and wrestle it away from you to kill you with it). Or, he will grab his other weapon. Just cause he has one knife out, does not mean he only has one.
Sure, they could run. But I would rather train for the situation where he intends to follow through with his threat.
You continue to fight, using the martial arts you've already trained.
As soon as you start to have any success with the disarm... the situation changes. It is not a martial arts fight, at that point. (not a TKD match, not a Karate match, or Judo match...) Its a guy trying to kill you, right now, with all his intent.
If its a gun, and you knock it out of his hand, and it goes "out of play," just like in your scenario... then you dance around, and play tag till he leaves or gets KOed. What to you then do with the gun? You wouldn't just leave it would you? Should you go unload it? Put the safety on?
With all the gun training you were claiming earlier... why are you so against adding 10-15 minutes of gun safety and basic shooting to a gun disarm class? This really confuses me. Do you really think that someone with no gun experience at all, will get more out of an extra 10 minutes of practice, without knowing anything about the weapon? I think that educating them about the weapon first, will make the rest of the training time much more valuable. Its quite easy to wrestle a gun away from someone without getting shot when they have no idea how to hold it, aim it, shoot it, retain it... And its training bad habits to assume that the event is over, just because the weapon is out of their hand.
When I train a gun disarm, it is not over until I have the gun, I have "tapped and racked" it, so it is ready to shoot, the gun is aimed at him, I have distance so he can't reach me and he is responding to my commands (get down on the ground!). It doesn't matter if I took the gun out of his hand, or the gun gets dropped or flies across the room. I continue and expect my partner to continue, until I get the above mentioned position. This is the same for all my weapon disarm training.