He had plenty of time to conceal his annoyance as they were passing through the heart of the city, which had turned into a single vast and eternal building-site even as the normal business of the ‘Change and the goldsmiths' shops continued. Paving-stones were whizzing between Daniel and the Doctor like cannonballs, shovels slicing the air around their heads like cutlasses, barrows laden with gold and silver and bricks and mud trundling like munition-carts over temporary walk-ways of planks and stomped dirt.