It makes no sense. OK, let's ignore the issue of the half vampire student is still a student, someone to protect. And that he is essentially giving into terrorism of some guy shouting a demand from afar without any visible leverage yet.
Why post guards? Why not just take everyone minus the half vampire kid together to whatever shelter at once? Take the girls, and then come back for the boys? Waah? Because kids can't walk down hallways on their own, they need to be within a certain radius of him or their legs don't work, and he can only cram so many students within his magical radius?
Maybe he's a pervert and wants to be alone with the girls. That's about the best explanation I can come up with. And I guess the students are use to mindlessly following senseless instructions.
Edited by truepurple, 21 April 2016 - 01:03 AM.