In the beginning, those people didn't seem to want to do anything to him, or rather, they put him at the back.
When he was still in the cage, there were at most a dozen people in one cage. The cage he was in had less than ten people.
Later on, day after day, some people were taken out and could still come back, while others were taken out and never came back.
He didn't know the outcome until a week later, when he was taken out for the first time.
Those people seemed to be doing some kind of experiment, and they would do experiments on those they liked.
He would torture those he didn't like.
He subconsciously felt that the experiments those people were doing were not good things. He had angered them, and in the end, he was tortured.
However, he wasn't afraid. He had suffered a lot of pain since he was young, so he could bear it.
They beat people up purely to vent their anger, and they took whatever they could.