Its flight ended suddenly. It slammed, with cybernetic precision, into a black police chopper hovering over the waterfront. There was an explosive burst as the fridge car ruptured, with gaseous jets of frost and the bright cartwheeling of hundreds of cardboard boxes. The chopper snapped, buckled, and splashed dramatically into dirty seawater. It lay sprawled amid the floating boxes like a dragonfly crushed by a car grill.