Hong Kong protesters have promised a 'miracle' but China's national security law seems impossible to stop
https://edition.cnn.com/2020/05/25/asia/hong-kong-china-national-security-law-intl-hnk/index.html
During pandemic, I guess China tried to show the country can easily block cities, and thought the fact would threaten Hong Kongers with fear of being blocked.
But, as a result, they didn't feel so, and marched for protecting the city.