A police officer told a jury that she saw her colleague motionless on the ground moments after hearing a loud bang.
Rachel Walls, 30, discovered PC Neil Kerr in Devonshire Gardens Lane in Glasgow’s Hyndland on July 21, 2020.
Ms Walls told jurors at the High Court in Paisley that the pair were on plain clothed duty responding to information about illegal activity in the area.
The officer watched men and a car from a vantage point in a nearby hotel before hearing a “loud banging.”
She later found PC Neil Kerr lying on the ground not moving with Zeng Xing Yu, 49, injured beside him.
Yu is accused of attempting to murder PC Kerr by striking him with a car on the head and body.
Yu allegedly then drove with the officer on the bonnet before hitting another car.
The attempted murder charge states PC Kerr fell to the ground all to his injury and danger of his life.
Yu faces a separate allegation of resisting and obstructing other officers in the lane.
Yu and Wang Wen, 30, are also charged with being concerned in the supply of cannabis on the same day.
The court heard from PC Walls who said she and PC Kerr were in plain clothes in a Vauxhall Corsa in Devonshire Gardens Lane.
PC Walls claimed she smelled a strong scent of cannabis and went to the nearby Hotel du Vin to ask for CCTV.
The officer stated she was led to a room on the second floor which had a viewpoint of a safehouse on nearby Montague Lane.
She stated she saw men with South East Asian appearance involved in activity with bags for life and a Mercedes car.
PC Walls stated she radioed her colleagues to report the activity.
She claimed she heard one of her colleagues shout: “Police” as the men ran off into gardens of residential properties.
PC Walls added: “On hearing the officer saying stop, I heard a loud banging.
“As no one was connecting on the radio, I went outside to assist.”
PC Walls claimed when she arrived at the scene, colleague Stephen Mooney was struggling to handcuff Weng who was allegedly resisting arrest.
She then claimed she saw Yu also resisting arrest by “tensing his arms, making it difficult for police to apply handcuffs.”
Prosecutor John McElroy asked where PC Kerr was on Devonshire Gardens Lane.
She replied: “Lying on the ground when I got there.
“It was hard to tell how he was, he wasn’t moving.”
PC Walls said he was receiving first aid by a young boy or a man in his 20s.
She stated she gave Yu first aid by putting evidence bags under his head.
The officer claimed Yu was searched at the scene and his wallet containing £600 in £20 notes as well as his driving licence and bank cards were recovered.
The trial continues tomorrow by judge Fiona Tait.