That last video posted by edpc , this is why in some senses, it doesn't look to me, like some HK police really have this heart in the matter. I don't know, the police could be a lot more brutal. Maybe that's a silly thing to say. Beware if the Red Army or their henchmen shows up, that's what I think.
That Hong Kong Free Press twitter showed some sort of law enforcement though, with the flag of China (PRC)... I think he was wearing an olive green uniform.