When Bai Ling Shuang heard Han Sen claim that the road had been difficult for him, she rolled her eyes. She had seen Han Sen running casually up the mountain, making the ascent without breaking the smallest sweat. He wasn't gasping or red in the face. It looked as if the trek hadn't even been much of a bother.
Still, Bai Ling Shuang didn't say a word. Han Sen was carrying her up the mountain. From her perspective, it looked like Han Sen was actually leaving the staircase, walking away from the mountain and out into the open air.
In reality, they were still going up the staircase. Bai Ling Shuang only thought they were walking over open air because of the distortions within the dimension.
As he walked, Han Sen noticed Bai Wei. She was stumbling forward like the other royal children, making no progress.