Master Mingyu was stunned by this scene. The requirement for this stage was that the monk had to endure the whipping without shouting in pain to pass the test.
Of course, the secret realm wouldn't allow the overseer to keep on whipping forever. Eventually, a stone would fall from the statue and kill the overseer.
The overseer had done much evil, and his death by the falling stone aligned with Buddhism's principle that good is rewarded with good and evil with evil.
Having presided over thousands of Western Heaven Secret Realms, Master Mingyu had seen countless monks make decisions in the secret realm. The greatest challenge of this stage was to endure the pain. Ninety percent of the monks couldn't withstand it until the overseer received his retribution and would cry out in pain. Only the ones who struggled and gritted their teeth could hold on. That's why he had high hopes for Xin Zhen, who had entered a state of 'forgetting both self and objects.'