Climing a tower? LOTR cast?

A shortish dream remembered.

I was following a group climbing a tower.  It looked like a Dwarf, or Hobbit was running up the steps of a tower, going up in circles.  Every once in a while I could see a hallway leading off into the distance go by, but they continued to climb.

Behind them, was a young woman, followed by a larger group, at least one Dwarf, and another Hobbit, and others as well.

The first person ran past another hallway, and I could see off in the distance a caged in area, with prisoners behind the bars. One of the women yelled out "They are following you!"

The first person suddenly came flying down the steps and the young woman, and the others caught up and passed up, reaching the next landing.  A cage door swung shut and locked.  She looked up and said "Gandalf, why are you not fighting back?"  Seeing though her eyes I could see one Dwarf, along with some others.  The Dwarfs shoulders were hunched down.

I woke up after this.