Brother Xi, what action is this? You don't play by the rules. How should I reply?

In this case, the reply method is as follows:

The meaning of this sentence is that the behavior or decision made by brother Xi was unexpected and did not follow the routine or expected steps. "Playing cards without following the routine" is an online buzzword, which originated from competitive games and is used to describe those seemingly unreasonable strategies or actions that can achieve their goals.

If you want to express your gratitude to Brother Xi, you can say, "Wow, how clever! It seems that I still need to learn from you. " . If you want to express your dissatisfaction with the Xi brothers' behavior, you can say, "But ... it doesn't seem normal." Wait a minute.