Norn has no talent for the sword. I knew Eris when she was ten, and Norn has no such talent. She probably isn't very far behind the average person. However, strength is something relative. In battle the stronger person will win, and the weaker one will lose. Losing will probably mean losing your life, so it isn't some trifling matter. So that Norn can win against most people, it'll be necessary for her to put in effort, for her to undergo harsh training, and for us to put effort into coming up with some method to help her win.