Who Said That Through Back Fist, You Can't Defeat the Foundation-Building Stage?

There was a water carrier in the Qingfeng Sect's Miscellaneous Yard named Chen Tong. He has three years of working experience, and the first seven years are spent doing odd jobs in the martial arts hall at the foot of the mountain. People in the courtyard called him Fool Chen - when he was kicked by the outer disciples in the street, he got up, patted the dirt and apologized with a smile; when his monthly salary was deducted, he bowed his head and never said anything back. Only he knew that the left page of the old account book recorded daily necessities, and the right page recorded blood debts. Ten years of back-to-back boxing, punches punching in the air. Until that night, when the ancient jade in his late father's relics was stained with blood and his fists were clear, he suddenly saw clearly the truth of the world of immortality: those immortals flying with swords and the spiritual energy threads wrapped around them were not invulnerable. And his back-to-back fist, where the force of the fist trembles, can penetrate those shields! Three punches can break the Qi-refining body protection, and ten punches can break the foundation-building aura. But Chen Tong closed the account books and made a decision that went against his ancestors: not to fight yet. Killing a Qi Refining Stage will attract the Deacon, killing a Foundation Building Stage will attract the Golden Pill Elder. Until he can beat the brains out of the Transformation Stage with one punch, it's best to continue fetching water, sweeping the floor, and making smiles. So there is a ghost in the world of immortality: A certain outside deacon disappeared mysteriously, and the murderer was unknown - Chen Tong was lighting a fire in the alchemy room at the time. A certain Demonic Path Builder had his Dantian shattered by a punch and died miserably - Chen Tong was selling candied haws at the mountain market. Everyone said that there was a martial arts evil star in the world of immortality who came and went without a trace. Only Chen Tong knew that he was just a bookkeeper. "Who said that Tongbei punch can't kill you in the foundation stage?" "You can fight. But it's not necessary." "Unless... You force me to punch."