[git-pull]

It's not at that point yet. PRC does have a garrison inside HK but they're sitting still. It's possible they could go in plain clothed to collect info and provocateur to discredit the protesters. It'd cause a pretty big meltdown if they were busted doing that.

Aside from that: HK has control over its statutes. https://www.elegislation.gov.hk/index/en/subject

Basic law (the part PRC plays a role) is the constitution. For an overview: https://www.basiclaw.gov.hk/en/facts/index.html

Aside, Here's a better article: http://www.thestandard.com.hk/section-news.php?id=210397