"Ron, I agree with Luo Bin. When that tall boy was attacked by the Chamber Monster, the mirror in the corner of the Empty Classroom also came from the storeroom in the Gryffindor girls' Dormitory."
"The Heir must have moved the mirror there to cast some sort of magic through it. I think one of the Gryffindor girls is either the Heir or... helping the Heir set things up!"
He really was the protagonist. At a crucial moment, his reasoning still pointed him toward the right target. Luo Bin took out the metal box and opened its lid under Harry and Ron's puzzled gazes!
"A mirror?!!"
"A mirror?!!"
Harry and Ron exclaimed in unison.
"That's right. I found it in the storeroom, not far from Hermione. Harry, what you just said reminded me of something. Do you two remember the girl who was petrified by the Chamber Monster in the Library? There was a little mirror beside her, too. Maybe mirrors act as a medium for casting some sort of petrifying magic on people!"
"But lots of people have been attacked by the Chamber Monster, and only three had mirrors beside them... wait, no, it wasn't just three!"
Ron abruptly sat up straight, his small face turning deathly pale at the thought that had struck him!
"Ron, what have you thought of?"
Harry asked anxiously.
"Luo Bin, Harry, what do mirrors do?"
"They show your reflection. Every day, you look in a mirror to wash... wait, reflections! Mirrors can reflect images, but they aren't the only things that can. Water can, too!"
"Yes, exactly! There was a huge puddle on the floor when Mrs. Norris was attacked, and it was the same with Royd. Oh, heavens, Harry, come with me whenever I go to the Bathroom from now on!"
"But