Although Isabella casually told Nero to go beat Vilhelm, she did not believe in the slightest that it was possible. Even ignoring the fact that beating him even once would be no easy feat, beating him twice was basically impossible. It was not without reason that everyone in the academy had basically acknowledged that he was a prodigy.
Although she had glanced through Nero's file, and saw that he had many merits and accomplishments, he was the only one. Many cadets in the academy had prior service and merits, yet where were they now? Certainly they were somewhere, but definitely not in any position to challenge Vilhelm.
Nero, on the other hand, lowered his hand and smiled softly. While he was quite interested in that prodigy, and had every intention of challenging him to see what he was like, it wasn't as if he had been in any rush. Now, he had an official reason to challenge him, so that would certainly speed up the matter.
