The Lian Yun Mountain Ridge would be the celestials' last hope, once Zhong Yue climbed over the mountain and reached the other side, he would be in the land of Great Wilderness. Hence, they would have to kill Zhong Yue and the other human Qi Practitioners before they manage to cross the mountain ridge.
However, the Lian Yun Mountain Ridge was tens of thousands of miles long, no one could foresee the path that Zhong Yue and the other human Qi Practitioners with Feng Shouzhu would take through the mountain ridge. This was why celestials were stationed all over the mountain tops throughout the whole mountain ridge.
However, Zhong Yue had been entangled in the Divine Battlefield for one and a half month's time. By now, Feng Shouzhu and the others would have long trekked past the Lian Yun Mountain Ridge to return to the Great Wilderness.