Watching the group leave the front grounds, one noble studied them from his front window in the teachers residence tower. As the First Prince of the Onyx Holm empire, he accepted a windowed room rather than a luxury noble suite. This was to give face to the academy and make him seem like a humble man. Citing security, he asked to have no one else on the floor which wasn't unreasonable.
Other professors mentioned that they heard loud noise and banging but no one spoke about It since it was from the prince's floor. He was the first prince, it only made sense to completely renovate the entire floor into his personal suite and bill the imperial treasury.
From his makeshift palace filled with over-the-top decadence he watched the small group go. His brother had turned his back on him or perhaps knew something he didn't. No pathetic group of nobles would shake him, even if they had an heir to a steward present.