In the end, Leah followed the others while learning about Azzy's recent battle on the way.
By the time Leah arrived at the stadium, the battle is already started. Meanwhile, the stadium was filled with students, regardless of what academy they belong to.
She saw a guy with more soul power than her, presumably, rank-6, is on the defensive while there's a blurry figure with mere low-rank-5 soul power, constantly attacking him from different sides.
Neither of them is using soul power nor the Arcana spirits. It appeared to be a physical brawl.
Along with those two, two strong people are standing on the field while everyone else is seated in the audience section.
She assumed they were of rank-7 after comparing the feeling she was getting from the two of them to her Royal knights.