The knave didn't like any of her children to cry since she saw it as a sign of weakness, so every time Freminet would cry, he would hold it underwater until his very last breath

While he was going down slowly underwater, he saw someone swim above him... He saw a tail on the person... Perhaps it was a mermaid? No, he is possibly hallucinating. He decided to completely open his eyes to see if it was real or not. He looked with wide eyes, completely shocked

Was it an actual mermaid?