University campuses are the new front line of the Hong Kong protests. Images of defiant students clashing with armed police in centres of learning have stunned the world.
Yet perhaps the most shocking and potentially significant incident in five months of ever more violent scenes - and one of the main triggers for the campus protests - came when a police officer last week was caught on video firing his gun at point-blank range into the abdomen of a protester moving towards him. The black-clad figure slumped to the ground before trying to escape and being chased down.
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