"... And that is how I achieve success with Dual Art. It was an incredibly difficult journey but I was rewarded with this incredible Art as well. However, you don't have to go through that process and it will be faster with my teaching."
Seraphine said. She was a Rank-SS Hero, however, it was the first time that she was doing something like teaching. Which made her quite nervous like a normal person. Nevertheless, it was her responsibility as she was the only one who could teach them.
The lesson had finally started and Seraphine was talking about the struggle of inventing the new Art. She was also explaining all the things that are necessary for them to learn the Art like good control over mana and enough mastery of the Art.
While she was repeating something that they already knew, it also shows that knowing this information was important.