Because Nora had already killed all the students from the A-level House.
These students came from various prominent families.
Their deaths were being covered up by the academy.
The academy would inform one family at a time, after some time, minimizing the incident's impact, almost unnoticed.
Moreover, the students of the A-level House seldom interacted with students from other academies, which allowed the academy to pull this off.
However, if there were any more attacks on students...
The days ahead for Karea Academy would be extremely difficult.
Fortunately, this spell beast didn't land within the academy but instead chose the back mountain, a relatively insignificant place.
This could be considered a stroke of luck in an unfortunate situation.
The only one who was truly unlucky was the teacher who was injured by the fire barrier.