Trouble people to make trouble action. trouble person carry trouble flower at trouble area in trouble time. I hope trouble maker can buy flower for their parent, or this is the business flower.(Flower in this area= Big black Money) Why mo la la so many flower there.
In English, it would be called loitering in a police cordoned off area with the intent to gather, interfere, and mocking police authority. Non compliance to simple police order to vacate and escalate the situation with disorderly conduct is enough to get arrested anywhere. Hong Kong police is so friendly compared to police in America.