Couldn't
Throughout the fight, Rui had wondered.
How hadn't they lost yet?
She was a Martial Squire, was she not?
What exactly was happening?
Based on the power and speed she had displayed the first time when she had missed, she should have been able to mangle them with just a few attacks, if not one.
Yet when she fought the second time, she was noticeably inferior.
Rui had been able to dodge her attack, as had Kane. Nel had been able to withstand her attack without losing consciousness the first time, although he did the second time.
It was only after a few exchanges that Rui understood.
('She's given up on using techniques entirely.')
Her proficiency with her body was sub-optimal, adding on top of that incompatible Apprentice-level techniques and these two elements sabotaged her accuracy too much.