The so-called victory or defeat is determined by one move. It does not mean that a person is killed or injured in one move, but that after this move, the person who is at a disadvantage loses.
When it was proposed that one move would determine victory or defeat, the great elder of the Proud Sword Sect had already thought about which move to use against Gu Zheng.
The move that the great elder of the Proud Sword Sect wanted to use was not a dirty move. He would not dare to play dirty tricks against his opponent Gu Zheng unless Gu Zheng was at a disadvantage under his move.
The two confront each other in the martial arts field, (remember this website address: www.hlnovel.com