Plus, this sort of thing, where there's no injury involved, at most it's just a scuffle.
This capturing technique is really effective, it doesn't cause injury and it can restrain the other person.
"Who the hell are you? Let go of my son! I'm telling you, if anything happens to my son, you and I are far from done!" the woman yelled.
Old Tang deftly pulled out his credentials, "I've already told you, I am Yu Jianshe's representative lawyer. Here's my ID."
The woman looked at the credentials, then at her son being pinned down by Old Tang, and her previously charged face suddenly froze.
"Ahem, wrong again. Old Yu, why didn't you remind me!"
He took out the correct lawyer's badge from his pocket, "Now that's right."
The woman stopped talking, and her son dared not say a word; the whole scene suddenly quieted down.
Tang Fangjing let go of the woman's son and looked around, "Now, can you listen to what I have to say?"