China chess joke

Lao Zhang went to the chess club to play chess on his first day. He went out in the morning and didn't come back in the afternoon. My wife is not at ease, so let my grandson go to the chess house to look for it. At first glance, it is there. Lao Zhang said: Don't worry, finish this game. The grandson said: It's going to rain, so hurry home. Lao Zhang said, I don't have an umbrella. How can I come back? Sun Tzu has no choice but to wait. Sure enough, it rained heavily soon. Before the rain stopped, Lao Zhang killed several dishes in succession. Grandson said: Great, let's hurry back. Lao Zhang said that the rain has stopped. What are you in a hurry to do?