Concave, that is, you have a great responsibility, but you can ignore each other's attacks, which is also called just counterattack. For example, someone else has already made a move, and you can't fight back at this time except to continue to defend. If you are concave, others will beat the air, in turn, you will beat others for a short or long period of blood. This is called concave. For example, you were in the responsibility period of some killer skills, and it was really wrong for others to hit you at this time. Just before A arrived at you, you cancelled it with a Zhang Wudi SC. Originally, others wanted to contact you, and you beat you back. This is called concave. Of course, the responsibility of concave is enormous, that is to say, in general, if you concave others and are defended, then you basically want to suffer from others' losses. Basic physical invincible killing skills, especially dragon breeding, can't be cancelled by SC, because his own responsibility is set in this way, but it also exists in the category of greenstone in books. If you concave others, others will wipe, and when others fight back, you will immediately use a Zhang Yue symbol. Heavenly concave is a reasonable means, but most people are not concave, and they beat others with confidence. If you give someone a cold shoulder first, they may be very unhappy. Therefore, it is suggested to use the idea that "people don't pity me, I don't pity others, and if people pity me, I will pity others" in future wars.

Above.