[yeah, Itsuki absolutely believes that Yasusada would have told him if he could. That's why Kashuu is curled up in a ball, dunking on him.]

...I think that saved you, Yasu-kun. If you'd been refracted -- then you wouldn't have said anything. Jiu-chan was looking at your knife, but we were still running out of time. And we would have had to ask for your item to help confirm it. I don't think you would have helped if you'd been under a refraction.

[he looks a little pensive, even as he gives Kashuu a soothing little back rub]

Your honesty proved that it was you. And all of us knew that. Maybe some people voted for you, but most of us didn't.