Magical tools masters normally can't use magical tools, but Roji realizes that Rio used one to protect Bico. Meanwhile, Muhyo has collapsed after exhausting his ren, leaving him in a dangerous condition of mental numbness... the exact moment Rio has been waiting for.
That scar was made by 
forbidden magical law.
تلك النُدبة من تأثير قانون السحر المحظور
Jene, die verbotenes Magierecht
nutzen, tragen diese Narbe …
La cicatriz se hace
con Ley Mágica prohibida.
Quella è una cicatrice provocata
dal Codice Magico Proibito.
Essa cicatriz foi feita por
direito mágico proibido.
Такой шрам остаётся
от запретного Закона...