Edited sentence: (Burden of Proof fallacy.) Breaking/Tameshiwari was not a part of regular Karate culture & curriculum no more than it's not a Kung Fu's culture & curriculum.Absence of evidence is evidence of absence about existence in logic & academia.It was from power circus, sidewalk performance art, feats of strength which were sometimes dabbled by martial artists including a Judo black belt Masato Tamura who performed stone Breaking in 1940 then testified it was not Karate but Kiaijutsu/Kihapsul (Kihap/Kiai Techniques).Kihapsul/Kiaijutsu can be self-taught or taught by a Kihapsul performer; powerful strikes were created by trial & error with common sense strikes; these strikes were practiced by practicing Breaking, not by practicing martial arts.Proving Non-Existence fallacy.Such traditional feats of strength was common in East Asia including China (Iron Palm showed Breaking culture), Korea, Japan 100 years ago