Trial and Error

A dream from 2001 or so...
I had this a little while after I moved away from a bunch of my friends to a different state.

Me and by old friend (irl) B are standing in nothingness. It is just white that extends forever, and we are confused as to how we got there.
Suddenly a wall begins to build itself around us. It starts out translucent and slowly builds to full opacity, and is made out of bricks. It is a lot like a video game.

We notice quickly that the wall is trapping us and we begin to run toward one end of the wall, each of us taking different directions. We are to slow and are just behind where it is becoming solid. We end up meeting each other as the square fortress becomes complete and I tell him to leave first. He jumps out, and I follow, but the wall becomes solid on my arm that had not cleared where the wall was appearing.

B grabs my legs and begins to pull, and for some reason I don't understand I bend my arm so that it is hooked on the other side of the wall and I can not get out, even though there was enough space for me to slide my arm out. I tell him to make a break for it, he hesitates, but then runs.

It is like there is suddenly a society inside the wall, and there is a giant docking station. A humongous arc floats into the docking station, one driven by huge ants. I am terrified since I have no idea what they will do to me, but I still remain where I am. They shoot me in the leg with a dart and I feel my body slowly go numb and I loose consciousness.

I know they take me into the fortress and that I am kept there for a long time, but I forget the details of the middle.

They are trying to force me to go to part of the city I don't want to go when B returns swinging on something to swoop in for a final save.