"Rules!"
That's right, rules!
Take the "Teaching Building Rules" for example: [No one other than students, teachers, and patrolling security guards will appear in the teaching building. If you encounter anyone who doesn't fall into these categories, please return to your classroom immediately, and do not pay attention to anything along the way, even if it is a teacher calling you.]
[...Evening self-study starts after 18:00, but the school does not require students to participate in evening self-study unless the current time is past 21:00... During this period, if you see anything unusual outside the window or hear someone calling you from outside the door, ignore it.]
"Seeing something unusual outside the window or hearing someone calling from outside the door" again after 21:00, isn't that when the layers start becoming unstable?
Plus, with a bit of unusual weather, isn't it the same as the situation just now?
This underlying logic of the rules is like this!
