Because the ambulance is on a mission in which the patient in the car has signed an agreement with the hospital. If this time someone midway to see its ambulance, and to the ambulance to borrow equipment leading to the consequences then the doctor or nurse is a violation of the law, but with the encounter of the critically ill patients have no legal responsibility, the car has a patient at the same time equipment lending out doctors and nurses are not allowed to leave their posts, then this equipment can be used correctly? Because the ambulance once the mission is an emergency. The goal of the ambulance is to go to the aid of the person who called it. If you encounter other injuries in the mission is generally not to help. At most, it will help to call the hospital ambulance out to rescue. If the ambulance privately pull other patients, resulting in another patient can not be saved, the hospital is responsible.