The moment the thunder sounded, Zhang Xiaohua was enjoying the fruits of his labor, drawing in energy and refining it in an orderly manner. His perception was still outside his body, and when the thunderclap boomed high in the sky, it struck his sense of the energy he was drawing in. Immediately, he felt like a hammer had struck his heart, causing his throat to sweeten and a mouthful of blood to surge up. Unable to hold back, he opened his mouth and spat out a small mouthful of fresh blood, interrupting his "Nine Shallow and One Deep" breathing rhythm.