She couldn't follow him.
No matter how much she tried, she couldn't trace his steps.
His back was so far away that she thought he'd disappear from her grasp, but he always stayed on the edge of her perception, just far enough ahead to make her painfully aware of the distance between them.
It wasn't her fault, but she didn't know that.
She simply didn't have the faculties to fall into his rhythm.
Eventually, she stopped and watched him walk.
His steps were unbelievably light, but each one took him an unreasonable distance away.
While her steps could only carry her as far as her body allowed.
It didn't mean much.
The reality was just a difference in affinities. Without understanding Spacetime, it was impossible for her to trace his movements.
But the feeling it gave was more inherent.
This was the difference felt by many.