Rioters uses catapulta to launch petrol bombs and bricks at polices from the roof of the university.
Rioters blind shooting petrol bombs at the general of the police force. They have no idea what the bombs are actually going to hit.
A group of polices got caught with petrol bomb.
Source:
https://www.ibtimes.com/dozens-hong-kong-protesters-make-daring-campus-breakout-2868489
https://hongkong.liveuamap.com/en/2019/17-november-protesters-are-using-homemade-catapults-to-shoot