C98 Mountain Belly Fortuitous Encounter

After falling onto the platform, Long Xiao had been busy calming his emotions and healing his injuries, yet he hadn't noticed anything. Right behind him, where the spear had been, a small, deep hole appeared. The mountain breeze poured in, letting out a slight humming sound.

Was the stone wall empty? If it was real, even if the spear were to pry off a piece