He raised his sword on the right shoulder and looked like he was
getting ready. The blade let out a slightly thick blue light. He looked
like he was going to shake the earth as he stepped forward before
drawing a sharp diagonal 45 degree arc in the air. This was... a skill I
never taught him, the diagonal slash «Slant».

Eugeo, who was a moment late in his activation, let his sword
move at lightning speed and hacked at Jink’s sword that was swinging
horizontally from above. I watched the iron blade get crushed easily
and asked myself.

Eugeo must have used a wooden stick to practice the sword skill
countless times once he got home. He properly discovered the
existence of «Slant» during that practice, for there was no foreign sense
of it being a last minute thing in that action just now. The united
movement of Eugeo and the Blue Rose Sword dancing even had a sense
of elegance to it.

(Alicization Beginning, 357)