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To completely ruin him, you have to shatter his confidence, leaving a shadow in his heart, thus cutting off his path forward.
If you can't remove the shadow in your heart, you can't step onto the path of a Grandmaster, let alone a Great Grandmaster.
The shadow in the heart, the more you want to dispel it, the harder it is to do so.
In such a public setting, in this kind of occasion, it's easiest to form a psychological shadow for him, can't miss this opportunity.
If Cheng Tianfeng doesn't admit defeat, then we'll keep fighting until he completely admits defeat, only then will it be considered perfect.
...
Cheng Tianfeng staggered as he crossed the high threshold, blood already seeping from the corner of his mouth, his clothes somewhat disheveled, no longer maintaining his former graceful and steady demeanor.
He strode over to Chu Zhiyuan, staring intently at him: "Again!"
Chu Zhiyuan smiled at him: "Brother Cheng, is it really necessary?"