I call this place "The Hallway of Choice". You come into a hallway with dim flicker lights to show that you have a choice of two otherwise dark hallways to travel through. One hallway is empty and takes you to the next room. The other has a ghoul hiding around the corner that scares you before forcing you to go back and take the other hallway to freedom.
The barrier at the end is just a simple portable wall so that a dead end can be created at either hallway in a matter of just a few seconds. It is long enough to cover the end of the ghoul-infested hallway and the access door so visitors who travel down the empty hallway don't backtrack or enter the access room by accident.
On top of the barrier is a small strobe light that is triggered when the victim rounds the corner. I visualize the ghoul actor using a hand held push button remote for this purpose. Of course, you are free to do whatever you want.
The curtain at the end of the hallway is to help block light from beyond this room bleeding into the empty hallway.
I added drop portraits down both hallways in case you don't want to use a ghoul in the hallway or if you want to use a ghoul in one hallway and the drop portrait in the other.
The way I vision this, my only major recommendation at this point is that the outside walls be built sturdier due to fleeing victims more likely to run into the outside walls than the inside ones.
This is my first project that I am explaining in detail. My brains process information faster than my hands can type them which means I probably left out a detail or two. With that said...what do you think? Please be gentle.