The first odd thing you notice is that the overhead lights all down the hallway are all dark. A wan light filters through the closed, covered windows and a glowing red exit sign tries in vain to fight off the oppressive darkness.
Proceeding down the hall, you run into a girl. "run" is certainly the right word for it - she was standing in the middle of the hall, lost in thought, so quiet you didn't notice her at all. She looks to be about your age, and wears a jacket with your school colors. A classmate, then.
"!!"
"Oh, it's just you. You really surprised me! Guess I'm a bit on edge after what happened."
Hey, if you're here, then I bet you're trying to figure it out too, huh.
"Well, I don't know everything, but I end up eavesdrop- I mean overhearing a lot!"
"So, I'll tell you what I know."
"You didn't hear this from me, but..."