Dragon Age DLC help (Stone Prisoner) 2?

I've just started this quest and I'm completely stuck, I could really do with a hand. I'm in Honnleath and I've found the people in the cellar, and they're trapped behind some kind of barrier, but I have no idea how to release them. I'd love some help.

I've gone up to the barrier, tried to select it and nothing's happened. Is this a glitch? Can I do anything to help?Dragon Age DLC help (Stone Prisoner) 2?
Right click on the barrier, and it should start a dialogue and a cutscene with the people behind the barrier. Also, are you playing the PC version or the 360 version?

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