Masked protesters streamed onto the streets of Hong Kong over the weekend after the city’s embattled leader, Carrie Lam, employed colonial-era emergency powers to outlaw face coverings at protests. Demonstrators defied the emergency regulation that came into force on Saturday, displaying their creativity with a huge variety of masks. The city, meanwhile, ground to a halt. The subway was suspended and swathes of shops and malls shuttered following yet more violence on both sides.