Patient airlift
The air ambulance would be staffed by a pilot and two medics in a full ambulance configuration. The police aircraft would be kitted out to fulfill the police role but also able to take a stretcher patient. As an ex police observer, I would say the air ambulance took the most seriously injured casualty and the police aircraft took the other, along with a doctor/paramedic, either with both police observers or by leaving one behind as conditions dictated.