Anko had to ward off Yuuto's fast-paced attacks with the sword she was holding multiple times, at this rate she might be pushed out! While fighting back, he was also looking for the right time to dodge this attack.
Anko also had time to wonder 'How can he use such a technique?'
He's the one I'm overwhelmed with wanting to try out his new technique too but, he doesn't think it's right for him to try it for now!
As soon as Anko sensed the immense danger approaching her, and didn't want to be swept away by the pressure of Yuuto's sword, Anko avoided it by wrapping herself in a hollow (transparent) iron plate.
"...."
"You-"
Yuuto was surprised by such a good sword technique, Anko converted her element into a kind of shield like that.
To Yuuto it was extraordinary, to the point that he was surprised however, he felt it was cheating because Anko on his side had already set his terms, she was also the one who violated her own terms.