As soon as Akari's armour got snatched away from her, she was just like a weak and normal human being in from to Arata. She was sweating lightly and was complete confused. She had no thoughts of what was happening and what she should do.
Arata pushed her back and throw her off the ring. This process happened so quickly that Akari took a while to figure out that she had lost her duel against Arata. Thus, Arata won.
After the duel between them ended, Arata got up and dusted his clothes. Arata was already in a hurry, thus, while turning his back towards Akari, he said,
"Onee-san, looks like the duel has ultimately ended. And... You sure have gotten a lot better than you were when we were kids. Now, I hope that you accept your loss. Well, that's all, now I am going back. Bye."
As he walked away from the ring, he heard a sound of whimper from behind. He turned back and found that the Akari was sobbing as she was continuously shedding tears.