It's not surprising actually.
Chen Mu, though extremely powerful and in no way inferior to her or Luan Qiumei, was still quite young. His lack of experience and knowledge meant that he didn't recognize the scene created by the collapse of the Stone Vein Cave Heaven, which was very normal.
After contemplating for a moment, Xia Yu'r still slightly moved her lips, a thread of voice condensing into a silken line, transmitting to Chen Mu ahead.
"This is the collapse of a Cave Heaven, a Void Rift. Only individuals in the Blood Exchange Realm can resist it to an extent. Getting too close is very dangerous,"
The Hehuan Sect didn't have much animosity with Chen Mu. The True Disciples of the previous generation, the Hua Nongying sisters, were even willing to invest in Chen Mu. Now they were both gathering information for Chen Mu in the Outer Sea, so naturally, she didn't mind forming a good bond with him.