I have thought about talking to my wife for this type of situation to have a "sign" to give if she were taken hostage to go limp guaranteed bad guy won't expect that and she'll fall to the floor, while 10 rounds of 40 s&w are ejected out of my firearm.
This is exactly what I have been thinking as well. Not just go limp though, but actually throw you feet up and fall on your butt. There's no way he can support 130 lbs of dead weight with a forearm.