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Once Ben, Cassandra, and Rex left the principal's office, they met Master Fixten again and this was when the master suggested that they spend today in the academy to prevent follow-up assassination attempts.
This was just a precautionary measure since few assassins would dare to move against the students of the Obedin Mystic Academy a 2nd time.
The academy was lax at times, but protecting the students and the dignity of the academy was one of the priorities that stood at the very top.
Master Fixten's only regret was the real culprit not being found.
Since all the assassins stayed true to their dark creed and remained mute till death, no evidence was found and the real culprit who wanted the students dead remained in the dark.
Though Master Fixten clearly knew who was responsible for the assassination attempt, without evidence, he was powerless to move.