There's no mirror in front of him, yet the other "self" appears as if he's looking into a mirror, matching his every movement perfectly.
There's no water underfoot, but as he walks he can hear the sound of water. Xu Huo moves forward; the white glows he saw outside the door vanish completely, and the mental space returns to darkness. Only the other mirror-like self seems to emit its own light—tilting his head, he can see it clearly.
After walking for two minutes, he released the Spiritual World, planning to find the edge of this space as fast as possible—if such an edge exists.
However, unexpectedly, upon opening the Mental Portal, he ran right into an invisible wall. Glancing around, the portal is only a step away; meaning, his Mental Portal failed, and didn't bridge the distance. He hadn't sensed the invisible wall before him; it's simply that the body can't pass through.
He reached out and knocked on the wall, producing a deep, muffled sound.
