【明報專訊】AFTER this year's July 1 march, some protesters, responding to the calls of the Hong Kong Federation of Students, staged a sit-in in Chater Road as a rehearsal of the Occupy Central movement. On the one hand, such a development indicates that things in Hong Kong have now reached a critical point, where violent clashes or bloodshed could happen anytime. On the other hand, we were deeply impressed by the professionalism and efficiency the police displayed in the clearing of the sit-in, which, as witnessed by journalists and broadcast live on television, was meticulously executed.