Just one step in the chain of escalation by the pan-democrats. They need to precipitate a crackdown by Beijing, and seizing the government is the best way. Unable to gain control of the Executive, they are trying to generate a crisis through the Legislature. The other path (suboptimal) is through terrorist attacks, especially if they can conduct those within the mainland. There have been indications of that (bomb plots foiled) -- I think it is just a matter of time before the real Troubles begin.