Scene development

The first scene would consist of the guy who is the main character (Leo) eating dinner at the table with his mom, his dad, and his sister. The table is set with plates and silverware and food and drinks. Then it cuts to his family being gone off the table in an instant, a door opens and a man with his face covered in a black suit (Erebus) the demon is standing behind the door. 

The demon then gets closer and closer and we see Leo's hand shaking holding the fork. The demon is now standing where the dad was before. Then in like another version of the dining table the dad appears sitting where he was before but with the demon behind him holding a knife to his neck. The family appears again after the main character yells "STOP" and in the next scene the main character jumps out of his chair and runs to the front door. 

In the next seen he gets in the car and slams the door as he drives away he looks in the rearview mirror and sees the demon sitting in the backseat. His hands shaking as he grabs his phone to dial a number and he picks it up and he says "it's back." That scene is of him phoning his therapist because the demon is haunting him once again.

 This is where that scene would take place so you can see the demon in the backseat through the rearview mirror.