Many of these community efforts revolved around the idea of providing mutual support against a common enemy. Before protests began in remote suburbs, the door codes of housing estates in the area would be circulated on chat groups to facilitate protesters’ escape. After a protest, the ticket-vending machines at the MTR stations were piled high with coins to enable people to purchase single-use tickets rather than use their stored-value Octopus cards, which protesters feared would enable their movements to be tracked. Bags of coloured clothing, often neatly marked by size, would be left at station entrances to enable protesters to change out of their telltale black outfits and travel home safely. And down in the streets, as the police raised their black warning flags, protesters would shout up to the residents in the apartment buildings above: ’Saan coeng! (‘Close your windows!’)