Since Xu Rouguang couldn't track Youming, he then looked for Bingxing. They should be finished with sealing Dunzhao's core if not struggling at death's doors. Xu Rouguang seemed to be very confident in finding them while Lai Mingjie was being bothered by what he could feel in the depths of his soul. It was as if he knew that Bingxing and Lanyan were struggling to survive.
It didn't help that they were headed in the same direction Lai Mingjie could feel a sliver of abyssal energy moving around. Since the abyssal demons didn't carry her power anymore, he had a feeling that they were racing against Youming.
Just like what Lai Mingjie was secretly feeling—when they were almost there, Bingxing's life signature just vanished. Xu Rouguang felt fear and shock course through him and sped up for a few notches.