Yang Shi already comprehended the basics of saber intent. Even without drawing his Heaven Calamity, his intent is enough to kill anyone in the same stage as him.
Moreover, the opponent didn't even guard against the attack. So even if Yang Shi used only a bit of his saber intent, Yue Wuji was already injured.
Yue Wuji felt a tyrannical aura, as his chest was cleanly cut by the chop of Yang Shi' hand. Suddenly, a light glowed under his clothes and an inner armor appeared.
Yue Wuji blasted back as blood seeped from his mouth. His hands trembled as he clenched his sword even more tightly. He looked at Yang Shi with confused eyes.
After tasting defeat by his hands, he went back and cultivated, practiced his battle techniques. Even his clan provided the best resources for him. But now, getting defeated again, was a great blow to his confidence.