Used to amplify the intention behind punches, to collide auras, and to suppress the spirit.
Unless the disparity in realms between the battling parties was vast, like a newly established fighter going up against an ultimate fighter, it would be possible for the aura to briefly suppress someone, as if sealing them away. And yet, he was clearly an ultimate fighter, as was the Demon Idol Sect Master, so how could he be trapped by him!
In fact, this common knowledge was correct. However, Casio had mastered the essence of the Tyrant Fist for over two years, pondering many applications and mysteries of that peak realm, including extensive knowledge about expanding and suppressing auras. Additionally, his Southern Dipper Secret techniques were a combination of three top-tier schools of boxing methods, and included the Magic Golem secret weapon which had already surpassed the limits of top-tier secret martial arts. His boxing method's conceptual realm was extraordinary.