Sin and Chang's Samurai Sword

Chang wields the curved blade during a fake safety demonstration, its ridged spine catching the theatre's dim gaslight. The steel glows dully under overhead lights as he thrusts it through the Cabinet of Death to 'prove' its harmlessness. The ornate tsuka, wrapped in dark silk, looks more like an illusionist's prop than a combat weapon. Its unmistakable silhouetted threat halts voices in the wings, turning stagecraft into silent menace. The crowd hears safety; the Doctor confronts another act in Chang's deadly performance.