Zebedee, I do have some detail of what happened with the failure of the force generator mount. I have no information on what happened during the flight or what the flight crew did. I've read reports from Sikorsky and seen detailed pictures of the failure. While the mount and skin near the force generator were badly damaged, the inboard wall of the fuel sponson appeared to have very little damage.
If the active vibration control worked as it should, the force generator would have been disabled by the AVC computer very soon after it fell from it's mount. The AVC system has feedback from the force generators and accelerometers mounted nearby. If the generated force does not match the phase and/or amplitude that the computer is looking for, the computer will disable the system. While the generator would have knocked on the floor a few times after it fell, it should not have been but a few seconds.