The 64-year-old lawmaker has denied one count of common assault in the unprecedented trial at which Leung, the highest ranking Hong Kong official to testify in a criminal trial, appeared as a prosecution witness last week.

Wong is accused of hurling the glass when the chief executive was giving a speech during a question-and-answer session on July 3, 2014.

When the lawmaker aired a different clip of the incident last Friday, which seemed to show little bodily movement, Leung said he had frozen in shock.

The detective, who downloaded five different pieces of news footage during his investigation, agreed Leung moved his body slightly to his right. But he denied Wong’s suggestion that the chief executive displayed a smirk in one frozen frame.

“I didn’t see it,” Kwan said.

For two days the court has been deciding whether some of the news footage provided by prosecutors – including a clip from Now TV and two from TVB – should be admitted as trial evidence.

Kwan and a colleague, Sergeant Cheng Hong-ip, who helped to collect the footage, agreed with Wong that the clips could have been edited in post-production work by the media outlets.

In one of the videos, Wong was seen speaking to reporters. He said he had thrown too many things to remember what he had thrown exactly.

At one point, a subtitle suggested the glass could have slipped out of Wong’s hand, though Wong was only seen mouthing some words without any actual sounds being heard.

The trial continues before magistrate Chu Chung-keung, with lawmaker Wong Ting-kwong expected to testify.