Having enjoyed a wild ride in a helicopter that had lost three pockets of one forward rotor blade....providing lateral vibrations with a force and magnitude to cause the Cyclic to leave black and blue bruises on my inner thighs....it took a bit of doing before we reached the Engine Condition Levers and pull them back to shutdown the engines after landing.
Whether they are overhead or down on the center console as in my case....reaching for the things can be awfully hard to do.
If a hand was firmly grasping the Levers prior to it all going bad...perhaps if the hand was not dislodged....getting the Levers moved. might be a lot more probable.
The Question is how often do these events occur?