Fey's body became blurred, she felt that she had entered a higher frequency, and darkness covered her perception as her five senses stopped working.
She didn't let her phasing state include the two of her feet. After all, she needs them so she can stand on the ground, or else the ground beneath her would swallow her.
The only thing she could feel now was the cold breeze caressing her two feet.
Without further ado, she commanded her phasing to envelop her two feet. As soon as it happened, she went through the ground.
Fein watched his sister as she phased through the ground, only to bounce back to the surface at a faster speed.
Just like that, Fey bounced back and forth from trees, mountains, and the ground to boost her speed.