TMNT amp explosion

One of my favorite movies is Teenage Mutant Ninja Turtles II Secret of the Ooze. One of the final battle scenes shows Mikey hitting a chored on a key-tar (keyboard shaped like a guitar) and the loud sound it creates sends the evil-doer Shredder flying across the building. I've always wondered how this could happen. I've played my fair share of extremely loud amplifiers before with no such effect. After doing some thinking on this, it is apparent that sound waves cannot simply transform into shockwaves. After watching the scene many many times, i realized that it must have simply been the explosion of the amplifier that sends Shredder flying with shockwaves. Shockwaves send a sort of expansion fan that causes objects to move. Sound waves cannot move things.