Say you are the Master of Ceremonies at the academy awards. You have a mike connected to a state of the art PA system.
Someone comes on stage and socks you.
Wouldn't you think the sound of palm on face create a sharp sound? After all the mike is right there and capable of relaying your voice. Why wouldn't it pick up the sound of the battery?
I think both participants are actors. And i haven't seen a creditable photo of a battery actually occurring.
Now the question is why? Why create such an elaborate deception? Who really cares anyway? Does this advance the profession of actor? Or just prove you can fool anyone at any time?