The unexpected change in routine got all the cadets' attention - at least in Enlil battalion. These cadets were teenagers, true, but they were still the best and brightest - the ones being trained to become officers of the army. Even if they had not noted the peculiarity of their instructors prior to this, they weren't so absentminded as to completely ignore an unannounced assembly suddenly being held in the middle of the night.
Even though this was KMA, and the presence of the Head Dean kept it safe, in general everyone avoided unnecessary activities at night. The darkness was still the domain of the cursed and the haunted, and they were merely passersby.
