What I saw from the video was there were conflict outside and protesters tried to get into the Chinese Consulate. People inside the Consulate tried to block protesters to come in. Police came later and tried to pull people away from the Consulate but some protesters still wanted to get in and did not want to go.
It is not as peaceful as the protesters said. They did use force first and hit one person (who came out from the Consulate and took down a banner) to the ground and at the same time some protesters tried to rush into the Consulate.
中共领事郑曦原参与殴打抗议者画面曝光