This is a more recent account of the horrid happening that might answer some of your questions. Beyond that, I think this the full extent of the details the RCMP have released at this time regarding the attack on police officers.
Nova Scotia RCMP release terrifying timeline of 13-hour shooting rampage
“Police say RCMP Const. Heidi Stevenson and Const. Chad Morrison were working during that time at the detachment in Enfield.
“Both were communicating on their police radios with each other, and they had arranged to make a meet,” Campbell said.
Morrison was waiting for Stevenson at Highway 2 and Highway 224 when the gunman approached in a marked cruiser.
“What appeared to be a marked police vehicle then approached Const. Morrison,” said Campbell. “As they had pre-arranged to meet at that location, Const. Morrison thought that the vehicle was Const. Stevenson.
Campbell said the gunman pulled up to Morrison and immediately opened fire.
“Const. Morrison received several gunshot wounds, and he began to retreat from the area, driving his vehicle away from the scene,” he said.
“He notified other officers and dispatch that he had been shot and that he was en route to an EHS station for emergency medical attention.”
Campbell said it was during that time that Stevenson was nearby, believed to be driving northbound on Highway 2 while the gunman was travelling southbound.
“At that point, both vehicles collided head-on,” said Campbell. “Const. Stevenson engaged the gunman.
“The gunman took Const. Stevenson’s life. He also took Const. Stevenson’s issued sidearm and her magazines.”
When a passerby stopped to assist people in the crash, he was fatally shot by the gunman, who then set fire to both Const. Stevenson’s damaged cruiser and his own replica cruiser.....”