Though I can't think of any particular examples with screenplays, I'd suggest the first thing to try is to actually watch that scene and write it yourself.

One way to expand tension is with quick cut lines separated by spaces.

THE HARBINGER

creeps forward.

Its legs bent backward.

On fours like an rabid animal.

Its eye glow menacingly.

Holly inches backward. In near shock.




Probably sucks but you get the idea.

I would take a look at the script for Alien. There are several key scenes that will show how extended moments of terror are written and that script is readily available online

Go to the mother of all supernatural thrillers and read THE SIXTH SENSE.

It took me years to realize that when you see something on screen, about all you have to do is CLOSE YOUR EYES, picture the scene, and then write what you see...

Adhere to the very basic (yet rudimentary format techniques) and then simply write something like:

in the action line --

"BEHIND her, the ceiling ripples with an IMAGE... a physical form, morphing, writhing, becoming... a face in silence screams as if the wall itself were alive..."

The trick to it all is to write what you see in your minds eye... really, that's all the mystery there is to this...

Also, if you cannot find the script you are looking for, there are a myriad of companies located on Hollywood Blvd or Melrose possibly (in Hollywood) that specialize in tracking down scripts for you. Look them up, and they can get you a copy of most everything for about $15 bucks plus shipping and handling.

Good advice Ryan, focusing your mind on the picture really helps me, but it does take practice. I try to see a scene the way a camera might see it close up, long shots, etc.

Not a supernatural thriller, but the opening scene in "Back To The Future" comes to mind, with the ticking clocks and Eienstien's dog food bowl.