He old man nods, apparently satisfied. He stretches out a leg, apparently working his toes into a pile of particularly disgusting-looking filth. As he struggles, he says, "By your speech, you're from Salisbury, yes?"
He grunts in satisfaction and you see a sturdy iron key emerge from the pile of filth, clutched in his toes. He gives a kick, and the key arcs through the air, missing Gwyn entirely. In lands on the stone floor with a clang and skitters towards a grilled hole in the floor. Cedwyn manages to quickly slide out and trap it with a foot a moment before it would have fallen down through the grate. You all breathe a sigh of relief as Cedwyn drags the key back and manages, through some tortured acrobatics, to get the key into his hand. The key is foul and smells of a sewer, but it is all worth it when you hear the click of the shackle lock opening. Cedwyn gets his other hand out, and in short order the three of you are unlocked.
The old man waits patiently for you to unlock his shackles, looking a little nervous but hopeful.