Knight had also lost his knife on the nature-strip. He only had his M14 rifle and 17 rounds of ammunition, having discarded the other two firearms. Police chase Following his decision to withdraw, Knight turned around and climbed onto the western platform of the Clifton Hill railway station. He ran north along the platform and then continued moving north beside the railway line. He reached a fork in the tracks at around 21:46, and decided to follow the left fork. He spotted a police car in the northern end of Hoddle Street and fired three shots at it. The police car contained Sergeant Graham Larchin and Senior Constable Betty Roberts, who were not injured by the gunfire but who abandoned the car after Knight ceased firing. After firing at Larchin and Roberts's police car Knight moved into a nearby cluster of trees, sat down and smoked a cigarette. Minutes later, police Aerospatiale Dauphin helicopter VH-PVA – call sign "Air 495" – arrived over the Clifton Hill area and began searching for Knight with a powerful searchlight. A minute later D24 ordered the Victoria Police's elite Special Operations Group (SOG) to attend the scene. Knight finished his cigarette and continued moving in a north-west direction towards Northcote. He crossed over the Merri Creek, which bordered Clifton Hill and Northcote, and took up a position at the end of a road bridge which spanned the creek. Just before 22:00, he fired a shot at a passing police officer, Constable Colin Chambers, who was slightly wounded in the right side. After shooting Chambers, Knight moved back across Merri Creek into the adjoining suburb of Fitzroy North. The police helicopter had found him in its searchlight and was following him. He ran into a line of trees beside the railway line in an attempt to avoid the searchlight, but at 22:05 broke cover onto the railway line, knelt down and fired three shots at the aircraft as it circled over him. The police helicopter, containing Senior Constable Trevor Wilson, Senior Constable Darryl Jones, Constable Keith Stewart, and Ambulance Officer Alan Scott, was hit by the first shot which pierced its right main fuel tank and forced it to make an emergency landing on a nearby sports field. McKean Street and arrest Knight continued on into Fitzroy North and headed down McKean Street in an attempt to reach his ex-girlfriend's house. It was now 22:13