After Damien caught up the Katherine, the two began talking about their fights. While Damien's was a normal fight story, Katherine's was on another level.
The fight had started normally, with the dark horse utilizing his darkness element to corrode the surrounding environment and trying to corrode her as well, while Katherine fought back with her wind. She created a field around her that the corrosion couldn't penetrate and attacked at range with her wind swords and bullets.
She hadn't used her illusion affinity yet as she decided to train her wind during combat. As the battle raged on, the dark horse became more confident and went on a fierce offensive. He used his darkness arrows to penetrate her field, allowing the corrosion to affect her.
However, this was when something unexpected happened. When Katherine felt the corrosion affecting her body, she suddenly received an epiphany about her use of illusions. Her thoughts were simple.