Hong Kong Police beat up hand-cuffed (with plastic zip-ties) protestor Civic Party member Tsang Kin-chiu after carrying him to a (not so hidden) corner.
There is also video of a man wearing a similar t-shirt to the person beaten up by police throwing water on them http://news.now.com/home/local/player?newsId=115049
If they are the same person – then arrest and charge him. But a gang of police beating up a hand-cuffed man. Disgraceful, the policemen involved have been identified – but not arrested!