Li Fan still believed in Yuepo's strength; the people of the Beichen Sect are straightforward, showing exactly what they are capable of without distorting their abilities with tricky stages or deceitful tactics like a sudden surge of power.
Moreover, the demons near Mo Zhu Mountain over the years were all slaughtered on Yuepo's missions. She's not a novice without combat experience anymore. Though it's currently one against two, it shouldn't be much of a problem. Using the sect's classic strategy: kill one, then another—simple as that.
But such solid capability doesn't quite align with her being caught off guard in an ambush. So, Li Fan lays in wait, keeping an eye on the situation, curious to see what other mystical skills the Sanxiao Hunyuan Palace possesses besides the Mixed Yuan Dao.