The Legislative Council descended into chaos on Thursday during the debate on controversial proposals to change its rules. At one point, security guards dragged People Power lawmaker Ray Chan head-over-heels to get him back to his seat.
Chan was among several pro-democracy councillors who got up to protest against the proposed changes. They think they will seriously undermine the council's ability to monitor the administration.
But government backers think their rivals' actions may have violated the law, which bans anyone from interrupting council meetings.
"It's very likely that the action is contrary to the Legco Powers and Privileges Ordinance and we hope that the pan democrats can seriously consider this ordinance and avoid breaking the law,' said DAB vice chairman Horace Cheung, who is also a lawyer.
The Democratic Party's Ted Hui was among those who left his seat. He brushed off suggestions he was breaking the law.
"I'm not afraid. I think that's so ridiculous, you know, using the ordinance," he said.
Hui said the ordinance was there for protection, not as instrument for suing people, and that they hadn't used any violence. He said the proposed rule changes have gone beyond what is acceptable to the people of Hong Kong.
"If the pro-government camp succeeds, we will lose our power to scrutinise the government for ever," he said.
Throughout the day, dozens of protesters - both in favour and against the rule changes - gathered outside Legco.