!audio.isPlaying problem

Im trying to make that when i look at enemy at certain distance it plays a dramatic sound once. Even though im using !audio.isPlaying it still plays them stacked.

if(distance < 10 && isMoving == true && !audio.isPlaying){
				audio.clip = growl;

Whats wrong with this?

Instead of that try using audio.PlayOneShot() , this would be what you need in your code .