Of course this wasn't amusing to Rinia and Pursena. Though they found it unamusing, the difference in their power was clear, and they had already run out of underlings to use.
At best, because the special students Cliff and Zanoba who entered last year were rampaging about, they used it as a pretext to pick a fight and defeated them. They used Zanoba to gather information on the princess, but they didn't plan on revenge. Recently, though they still showed some bad behaviour, they were properly attending classes. You could say that they were rehabilitating.
To a new student like me, it was just a story about Fitts-senpai's greatness.
Case closed.
At least it should have been.