Yuya doesn't move, staying in place to hold the shield up. He's trying not to be nervous, but his hands shake a little and there's open disturbance on his expression.

"Stop!" He shouts at her, voice tight. "Stop using Rita to get at him!"

It's an empty demand because Yuya can't do anything about it. He can't even be totally confident standing here with his shield will do anything against them if she really wanted to push through. But he doesn't want to just cower from her using his friend, their friend like some puppet. There's a deep offense that keeps him standing despite his fear.