Generic Element in The Exorcist

How do generic elements encourage the audience to anticipate events in the attic scene in The Exorcist?

• It is at night
• Dark
• Young-ish female, attractive victim
• Vulnerably dressed
• Lights don't work - lights a candle - throws shadow
• Noises in the attic
• Clutter - looks like a confined space
• The entrance to the attic - black
• No music - audience listens too
•  Tension drops when handy man enters - light/sound/company
• Bar shadows - suggests she's trapped