S1·E590 Dance School Mass Murder

A woman sees a mysterious shadow and panics. She screams for help and the watchman rushes in. The watchman however refuses to have seen anything so he initially dismisses her. But upon her insistence, he goes to check but doesn’t return. The woman gets worried and goes outside to what had happened to the watchman, but to her surprise, she sees him dead, sitting next to the pool and the next thing she knows is that she has woken up in a hospital.