When Dang Wenzheng seized the man, he was still thinking about the words Heizi and his gang had told him.
He was initially concerned, thinking that the situation was serious from their description. However, he easily apprehended the suspect, who did not seem to have proficient Kung Fu skills and didn't put up a fight. In fact, he hadn't even considered that the man would resist. Otherwise, he wouldn't have started talking before securing the captive.
So, when the fake mute beggar fought back, Dang Wenzheng was in the middle of speaking and was taken by surprise. He was pushed back a few steps, and without Xiang Changqing's intervention, he would have fallen flat on his back, making a spectacle of himself.
Although Dang Wenzheng did not make a fool of himself, Xiang Changqing, by assisting him, had allowed the mute beggar to slip away into a nearby alleyway.