Hengdian, China — Everything seemed to be business as usual as filming got underway on a dimly lit set in a basement in Hengdian, a town nicknamed “China’s Hollywood” for its sprawling complex of film studios. Cameramen raced around hectically setting up lights and checking shots as choreographers ran through fight sequences and a prop team worked out how to hoist a net that would later restrain a hostage. Actors, most dressed as assassins and …