Africans have been hunting elephants for centuries before guns were invented, however, the African meat hunter doesn't always care how long the animal takes to die. There's no question about how effective modern bows are in the right hands. Nevertheless, it's still a heart/lung shoot and although it may be quick, it is not instant. Its a question of individual ethics and everyone has different ethical interpretations, but the least traumatic method for both quarry and other group members is the brain shot. Its like fishing for dolphin (not mahi mahi) - everyone knows its possible, but how many would?