We then backtrack through Xavier's chaotic life.然后我们回顾了泽维尔的混乱生活。The accident happened when Roland was walking home with fellow student Karl Xavier.事故发生的时候，罗兰和他的同学卡尔·泽维尔正走路回家。Xavier grabbed his arm and dragged him over to the window.泽维尔抓住他的手臂，硬把他拉到窗旁。