Something treeshaped wouldn't help him anyway. He took one of the bars of the door in his hand and sized it up with a little bit of a pull. "As a last resort, if we have no other choice. Cause it'd take forever to cut through this with a chain like that." Not that they didn't have anything but time. He was more worried about the cold getting to them at the moment. "What you might want to try, though, and it'll take time to do, pull out some of the fill of your mattress, and start a small fire in the sink. You can do it moving the chain over something else with the fill really close." At least he could figure away to keep her warm.
Cullen shifted so that he was sitting on the floor, reaching between the bars he began sizing up the lock with his fingers. Trying to figure it's size even if he couldn't figure out the pins. Trying being the key word. "The hell. Why ain't there locks on these doors?" How in gods name did they stay shut?