From artist's pixiv:

当然の帰結

「いつかああなると思っていました（太子談）」
聖「それを武器にするからには覚悟していたのだろう？」

Obvious Consequence

Crown Prince : I know that would happen one day.
Hijiri : You are prepared when you decided to use that as weapons, right?

I wonder if the mask in the last panel qualifies as a reaction face.