So assuming that energy is neither created nor destroyed during such a kiai (i.e., there must be an energetic bookkeeping balance between cause and effect), how would you suggest these things happen? Sound? Sound plus some accompanying phenomena (if so, what?)? Seismic activity? An "unseen, unknowable energy" (remember that in the real universe, energy out does not exceed energy in)?

Frankly, I've seen instructors wave their hands and students fall over, but I don't know of any instance in which the energy equations were overcome. So I always suggest that people do a realistic analysis, statics or incremental analyses, etc., before they go chasing unicorns.

Best.

Mike Sigman