The moment that Ash was able to step back a little and then sidestepped, she already put herself in a good enough position to attack.
It may not have been the best possible outcome but it was the best that she could come up with in a short amount of time.
Jason was still moving forward like a mad bull charging and missing its target.
He had aimed for a takedown move as his hands were reaching out to grab her.
It was like he was planning on grabbing ahold of her and bringing her down using his heavier body weight and the power gained from the momentum he built up while running.
It showed off his desperation to catch her and keep her somewhere that he could reach.
Even his fear had risen a little more and Ash was able to sense it.
Ash could see how desperate he had become and it made her feel like there was nothing for her to fear.