 He initially asked the official Yuwen Xiaobo (宇文孝伯) to ambush Yuwen Xian, but Yuwen Xiaobo refused, he instead plotted with his associates Yu Zhi (于智) and Zheng Yi (鄭譯).One month after Emperor Wu's death, Emperor Xuan summoned his uncles to the palace under the pretense of giving them new commissions, but took the opportunity to ambush and capture Yuwen Xian.Emperor Xuan then had Yu accuse Yuwen Xian of treason.