In their town, deep in the last century, the paramedics and emergency medical technicians that staffed the life squad’s ambulance were volunteers. They were on call for twelve-hour shifts and carried beepers so they could be summoned whatever they were doing.
He was on call and at home when he heard an accident on the corner.
He ran down to see if people needed help and he found a two-car accident. So, he secured the victims as best he could, got some bystanders to put one of the victims in traction, and got others to call the police and life squad and tell them he was on site and needed help.