TL;DR: He Xuan, after some thinking, comes up with the perfect revenge plan to anger Shi Wudu.
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He Xuan had been writing in his diary. He was still planning the perfect revenge plot for the Shi brothers. He's considered murder more times than not, but something is stopping him. Whether it be fate or Hua Cheng's nagging (he only said it once, but still), he considered other options. After meeting Shi Qingxuan in Heaven, he had been even more hesitant to murder Shi Wudu and have them watch. With the knowledge that Shi Qingxuan knows nothing of the fate swap, he doesn't have anything better to do. Then Hua Cheng called him via the spiritual communication array. Zoning back in, He Xuan hears Hua Cheng say something that he normally wouldn't care for.
"... Of course, I wouldn't dare defile His Highness, but to think..."
He Xuan doesn't care for that- Heaven, he doesn't even know the context or what he says after, but he suddenly stands up and slams his hands on the table so hard that his bonefish look back at him. And then, he writes.