Fang Xing arrived around the time the cultivators were trying to break the formation. He cursed observed the current situation while cursing at the Ghost prince for fun, but he was actually more anxious and curious to see who was inside the formation than anyone else. It wasn't until someone found out about the shortcut into the formation and everyone began to fight for it that he saw Xu Linyun. That she—his shijie—would actually step out at a time like this to protect him—her little shidi—even while everyone else was fighting to kill him had left him rather surprised.
Even when Xiao Xue and Hou Guimen had stood up for him outside Chaotic Stone Valley, they'd been standing up for Fang Xiaojiu and—more importantly—the pride of all Snowy Mountain. As for this long-time-no-see Qing-Yun Sect's Shijie Linyun, the one she stood up for was none other than Fang Xing!