Tang Zhen's goal in capturing these natives was to obtain information from their mouths.
In an invasion war, the importance of intelligence could not be ignored. It could help the cultivators in Lou Cheng to attack the enemy more efficiently or destroy a plane in other ways.
For example, they could destroy the communication and transportation systems of this world, making it impossible for the natives to communicate with each other, and gradually separate them into isolated islands.
Without a unified leader, the natives would become a pile of loose sand. At that time, they would be unable to protect themselves, so how would they dare to take the initiative to attack the cultivators in the city?