Later that year, after Western Qin's prince Qifu Gangui was defeated by Later Qin, Qifu Gangui surrendered to Tufa Lilugu. Initially, Tufa Lilugu's brother Tufa Juyan (禿髮俱延) suspected Qifu Gangui's sincerity and requested that Qifu Gangui be exiled to west of the Qinghai Lake—a suggestion that Tufa Lilugu rejected on the grounds that if he did so, no one else would surrender to him. However, when Qifu Gangui subsequently redefected to Later Qin, Tufa Lilugu much regretted the decision not to exile or kill him. Later, when Qifu Gangui's son Qifu Chipan tried to defect as well to join his father, Tufa Lilugu was prepared to execute him, but at Tufa Rutan's urging (that killing a son for wanting to join his father would be seen as narrow-minded), did not do so.