Is Someone There?

Terri’s shift was about to get over in an hour and she was just checking if anything else was needed to be done before she leaves for her home. She was walking in the corridor and suddenly the light went off. She stood there for a while waiting for the power back up to be up again. It was all dark, she didn’t even move an inch. Something was off around her, where are the other people from the staff? Have they all left, already? She heard some footsteps coming towards her that synced with her heartbeats. Who is there?