Chapter 573: Chapter 497: Professor Cui_3

Yang Xiao was maintaining the balance as best as he could, the process was excruciating, much more painful than the previous test.

One minute.

Two minutes.

Yang Xiao gritted his teeth and persevered; he learned from experience and even found some techniques gradually. Eventually, he even sensed that the spiritual power fluctuations of the opponent were becoming erratic, without any pattern, as if reaching a limit that was hard to maintain.

Yet, Yang Xiao did not slacken at all. He suspected this was a blinding technique of the opponent. Having fought strong enemies and faced life-and-death situations, his personality had become increasingly cautious.

Just as Yang Xiao focused his attention, waiting for Professor Cui's lethal strike, suddenly, the spiritual power fluctuations behind the curtain vanished, followed by the blurry figure swaying side to side and then—a "thud"—falling to the ground.