Riot Police lost control, seen swearing and used pepper-spray at pedestrians

Police officers were seen setting up perimeters on one of the pedestrian overpass connecting to the Shung Sui MTR station.
While ordinary citizens were prohibited to pass through the perimeter, people with carry-ons and luggage were allowed to go through the perimeter with no obstruction by the police.
One of the police officers suddenly lost his temper and proceeded to shout profanities at nearby pedestrians and began to pepper-spray on-lookers. Many of surrounding people were affected, including an elderly lady.