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Generally speaking, cultivators are accustomed to witnessing matters of life and death, and when they see a large number of their mortal kin harmed by Demon Beasts, they are naturally expected to feel empathy and anger.
There isn't a rule that requires cultivators to sacrifice themselves to save those mortals harmed by the Demon Flood Dragon.
One may opt not to save others if their abilities are insufficient.
However, having not even a trace of sympathy, and even using the matter as a topic of conversation, would be exceedingly cold-blooded.
And such cold-blooded individuals are clearly not the sort to make trustworthy friends.
Xu Kaishan had not noticed Zhou Chun's subtle movements, or perhaps even if he had seen them, he wouldn't have been able to guess his inner thoughts.
Xu was immersed in his own rhythm.
