"Stop that! Does us no good for you to knock yourself cold, now does it? If you listen close and do as I say, we'll be free quite soon now. The captain's gone ashore in search of shinies."
Jack listens closely for footsteps on the stairs, for the sound of anyone in the companionway besides the usual bustle of sailors on deck. The deck boards will need swabbing and the rigging will need to be set while they're anchored. Hopefully the bastards are making a slow show of that, if they know what's good for them! They'll never make sail quick enough if the canvas is fully furled and lashed when he gets to deck.
"We'll be gone before 'e knows what's 'appened and there will be no more iron bars for the either of us. Savvy?"