"You must not go out or you will simply be falling into his trap. You are not his match!" Ye Mo said, "This is exactly what he wants, he wants you to act rashly."
Wan Cheng Yao was much stronger than Jiang Hua and Xia Wuchang. And, he was much smarter as well. Ye Xiwen planned to stay low and appear only when he was strong enough to deal with the enemy.
But now, Wan Cheng Yao's tactic was to force Ye Xiwen to come out, and if he did, he would fall under the wind. Ye Xiwen was most disgusted by people like Wan Cheng Yao who used their own potential to oppress and manipulate others and could go to any extent to achieve their goals.
When Wan Cheng Yao noticed that Ye Xiwen was not coming out no matter how much he waited, he used this seemingly innocuous method to bully and kill unrelated people and turn everyone against Ye Xiwen.
Wan Cheng Yao had long sacrificed his moral values and no longer valued human life. That was the reason why he could come up with such a vicious method.