Friday at SIS

I walked into SIS on Friday and all of the lights were off. There were no teachers around, and I couldn't see any other students. I checked my phone and there was no service or WiFi. I heard the doors lock behind me. What happened next was crazy, the lights flickered and turned on. The ceiling fans started to spin, as it got faster, faster, and faster. Elevator lifts open slowly, a shadowy figure appeared in the elevator, the figure wore a dark hoodie, and a backpack at the back, it looked like a female. The figure slowly walked down the hallway and it creeped over 8C's classroom door. The figure tried to open the door, but it was locked and won't budge. The figure took out a key and unlocked the classroom door, how might the figure had access to the key of the classroom? It went in swiftly, and I followed silently behind it. The figure turned on the lights and the figure went to sit on the mighty Miss Yate's office chair. The figure said, "What are you doing here so early?" Realizing that, the figure was actually Miss Yates all along!