Miss Grace is a principal, a good principal, she might be afraid of the teachers(Miss Circle, Miss Thavel and Miss Bloomie), when the lights are on, it means that the teachers would stop killing the students but when the lights are off, it means that the teachers would start killing the students except the good teachers(Miss Emily, Miss Sasha and Mister Demi), Miss Grace was walking around and checking the students while the lights are on

Miss Grace: "hm.. Good thing the lights are still on"