Kira seems to know who Hinako really is, and wants her to give up her conquest of the school. It seems the only way for her to convince him otherwise is to fight him... and win.
I guess you want to demonstrate how,
with your fists...
...أعتقد أنّك تريد إثبات ذلك بقبضتك
Das willst du wohl jetzt
mit deinen Fäusten klarstellen …
¿Me convencerás con tu puño?
¿Me convencerás con tus puños?
Tu veux me le prouver
avec tes poings ?
Vuoi farmelo capire attraverso i tuoi pugni, eh?
Então você quer me mostrar
 com a força dos seus punhos?
Как вижу, хочешь доказать мне это на кулаках?