As Fin and Van fled for their lives, so did some others who worked for them while the students who were brought along using money and other means stood still.
The reason?
They were afraid, afraid of the dean's strength as well as his position. Afraid that if they tried to run, there would be no place for them in the academy or anywhere else as they knew that if they got caught running, they would be sent to their deaths in the harshest of places.
These students just lowered their heads in shame and stood still even letting go of the wolves they had captured, not knowing of the mistake they made.
The dean, being oblivious to all that, went straight for those who ran away. Not even knowing of the catastrophe he was leaving behind.
On the other hand,
Seeing the dean going straight for the ones running away, Ray got to work as well.