After the black spirit clansmen asked this question, the others around him continued to chatter.
They did not feel that it was dangerous to disturb a human fishing.
First, Yuchi's clothes were torn and tattered. From his appearance, it was easy to assume that he was a homeless and down-and-out tramp.
Second, Yuchi's tattered clothes did not bear the markings of the Black Heaven sect. As such, he was probably a wanderer. To them, a wanderer that could not even join the Black Heaven sect would be a puny weakling.
Third, the four people from the black spirit race could not sense any pressure emanating from Yuchi at all. He was like an ordinary human, and ordinary humans were trash.