New Zealand Herald journalist Keith Ng has been on the ground with the Hong Kong protests. He reports on black ops, violence - and the battle of rival songs.

There's a famous scene in the film Casablanca. A group of German officers are singing a patriotic German anthem while the rest of the club - full of exiles from Occupied France during World War II - stare down at their drinks. When resistance leader Victor Laszlo sees this scene, he starts singing the French national anthem, and soon all the exiles join in, tears streaming down their faces.

This scene

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