The appearance of the Dragon Taming Sword reveals a truth, which is that its master must be nearby. When everyone saw the direction pointed by the black light, they knew what it intended to do.
As a peak expert of the Lingyun Realm, Wu Zhukong's sensing ability wasn't too slow, and the black light came so fast that within the blink of an eye, it was only a few feet away from him.
At such speed, although Wu Zhukong could kill Xue Ningxiang completely before the Dragon Taming Sword could stab him, he wasn't absolutely confident.
Regarding the Dragon Taming Sword, Wu Zhukong, who already pays great attention to Yun Xiao, couldn't possibly not recognize it. He knew that even some physically strong gold-grade Heavenly Spirits couldn't withstand a stab from the Dragon Taming Flying Sword.
Even though Wu Zhukong desperately wanted to kill Xue Ningxiang first, he wouldn't risk his own life or any part of his body for a joke.
