The Running Carp

Lin Wenwen nodded and said, "Ah, you used to be soldiers! Eh, do you mean that only soldiers use those gestures?"

Lin Feng nodded and responded while walking, "That's why I said he seems to be an ex-special forces soldier."

"But, why did he make those gestures only to you?" Du Yuanxing asked. "Does he know that you'll understand them? In this case, he doesn't need to write anymore. If he has something to say to us, he can simply say it to you by using hand gestures."

"I am also wondering why he knew that I could understand those gestures." Lin Feng said. 

Du Yuanxing thought for a moment and said, "No wonder he said that he used to be your subordinate. It seems that he knows about you. That's why he made those gestures only to you."

Lin Feng spent a while pondering, then nodded. Du Yuanxing's words could be right.