Rei decided to teach Mei properly. He started small with tree-walking and water-walking after she managed the paper-sticking exercise. He had to give it to the girl, she was determined and a prodigy. It was obvious why she would become the Fifth Mizukage in canon. In just a week she managed tree and water-walking. Yes, Rei was there with her every step of the process, always sensing what she did wrong and corrected her. He would not be a jerk like Kakashi and just say, do it. It was counterproductive.
In Naruto: Reborn with Talent
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