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"... The Intruder Charm." See? Much more interesting than locking and unlocking doors and cleaning the classroom. "Though similar, the Intruder Charm is not to be mistaken for the Caterwauling Charm," she explained. "Can someone tell me what the Intruder Charm does? And what is the difference between the Intruder Charm and the Caterwauling Charm?"
Interesting! This was waaaay better than charms to unlock or lock doors. It was! Jory raised a hand.
"The Intruder Charm sets of an alarm or allows the caster to become aware if someone has entered through a door.'' He paused. Or maybe a window, too?
''A Caterwauling Charm causes an alarm to go off also, however, for the er borders of a certain area.''