Tang Xiu was well aware that treating Tang Yunde would heavily consume his mental force. In particular, the removal of those ash-gray substances blocking his mind sea and the brain ventricles, as well as the mass of coagulated blood, would require the complete coordination of his star force and spiritual sense. He was required to stay focused all the time, controlling the input of his star force and spiritual sense. All in all, the task was an enormous demanding necessity in itself.
Success meant that Tang Yunde would wake up and survive, and failure would result in his death.
Disappointing his mother was something that he never wanted. After all, for twenty years she had been suffering, and the good days she had always been painstakingly hoping for, had approached. Even if he had to brave the danger, Tang Xiu had to go all out.