《三国志·魏书·和常杨杜赵裴传》
赵俨说： 孙权趁着关羽刚交战的弱势，想要暗中截断他的后路，又担心关羽返回援救，担心我军趁着他们两军疲敝的时候进攻，所以谦逊地表示想要效力，但其实是想要顺着成败，观察局势，以看吉凶罢了。
俨曰： 权邀羽连兵之难，欲掩制其后，顾羽还救，恐我承其两疲，故顺辞求效，乘衅因变，以观利钝耳。
Zhao Yan said: Sun Quan took advantage of Guan Yu's weakness in the battle and wanted to secretly cut off his way back, but he was worried that Guan Yu would return to the rescue. He was also worried that our army would attack while the two armies were exhausted. Therefore, he humbly expressed his desire to serve, but in reality he wanted to follow the success or failure and observe the situation to judge good or bad luck.