the only time, i have not call for a ambulance when one was needed was when my cousin damaged a very large artary, i had my finger on the end as his dad ( Police fast car trainer - at that time) driving us to hospital . with a call though to the hospital we got him there and into the hands of a doctor in 7 mins. He was fine after 4 pints and a emergency op to fix the damage. rest of the time i call in the experts in green when needed