The Illusion Mountain
From the moment Yuying vanished to face off against the other Fishman, it took her just two exchanges to chop off her opponent's head.
Without even bothering to collect its core, she turned her attention back to Fruity, who was facing the other Peach Tyrant—the second bridge guardian.
At first, she was shocked by how Fruity was handling his opponent, not using any of his ice elements.
However, she quickly calmed down when she saw how he was managing the fight. It took only a few exchanges for her to notice some discrepancies in her master's attack patterns.
She would tell him about them later, so he could fix them before his next battle. As long as her master hadn't regained his memories, she would continue to be his teacher.