After experiencing such an intense attack, the guests were dizzy and fatigued; the students were also seriously scared. Because of this, Benjamin wanted them to rest as soon as possible. Thus, the opening ceremony ended hastily.
However, his goal had been achieved.
He wanted to make the existing mages aware of how horrifying the Church was and hopefully get them to realize that they must unite in order to banish the Church once and for all. What better way to convince them than with a direct attack from the Church themselves?
Of course, it was not good that the opening ceremony did not go on as planned - this would no doubt greatly affect the reputation of the Mage Academy. However, at least it was not all for nothing, right?