Trapped in Chapter 4

[clintdavidk]

I don't know if this is a bug in the game or something, but I went into a room in Chapter 4 where the Germans shot some British guy in the head and took me prisoner. When I woke up there was another British guy in the cell next to mine talking to me, then the guards dragged me into another room where I had to beat one of them to death melee style with a rifle, then the rest of the guards attacked and I killed them all. But now I seem to be trapped in this building. I found lots of weapons, but there are no other enemies, and no exits. One steel door that I think leads outside has a switch, but I pulled it and nothing happened. Does anyone know what's going on?