Tear gas and water cannons: Hong Kong students brave the front lines to livestream the protests

It was holiday time at Hong Kong's sprawling Harbour City shopping mall, and shoppers posed for selfies next to giant presents wrapped in golden foil, while toddlers jumped into a ball pit filled with fake marshmallows. College students Oscar Tsoi and Joanna Ho raced past candy-colored Christmas trees, on the tail of riot police and protesters.