Zhou Sulong was only able to eject the Seven-star Poisonous Centipede thanks to his reflexes being quick enough. Otherwise, Lu Xuan would've killed him immediately.
The look on Lu Xuan said that he had almost nailed Zhou Sulong. The latter was infuriated by that look even further as he noted his carelessness.
He thought that Lu Xuan's powers were far beneath his. As such, everything that Lu Xuan was capable of would've been pointless; nothing stood a chance against absolute power.
However, he had forgotten that his powers were not actually absolutely powerful over Lu Xuan's powers. Otherwise, he would have been able to kill the latter with a single move.
He deeply regretted being so careless, but it was already too late. He felt the toxins spreading throughout his entire body at a frightening rate through his bloodstream.