Inference (6)

The next scene that unfold did not surprise them but they are still left dumbfounded seeing that scene. 

When they arrived on the scene, the students, principal, Mr. Patill and Ms. Mae are all dead. Lexi was left alone in the room with the drug. Then later, she also killed herself with it. 

But what their witnessing now is Lexi taking revenge on herself. At morning, she would motionlessly sit beside Stella's bed but at night, she will escape the hospital and kill those men who was able to walk freely without being punished by their sins. 

Wherever Lexi goes, her hands will be covered in blood. The demon on her back will pinpoint to her every man who was involved in the drug case. Then she will kill them in the middle of the night. 

This indiscriminate killing of rich businessmen created a turmoil in the city. But the police weren't able to zoom in on her.