Was just a suggestion, I haven't tried it. Just trying to think how the helicopter shot might be differentiated as input from other unorthodox shots if it is in there.
Our arms/brains are capable of more differentiation in terms of playing different shots in the same area than the controller can receive as input, so I guess after a certain number of obvious inputs there has to be a few non-obvious ones if there are additional shots/animations so the game knows which ones to trigger without guessing at what the user intended.