I always carry a small fixed blade knife in my weakside pants pocket to throw as a distraction. I practice throwing it underhanded, some times it sticks sometimes it doesn't. I figure that any extra time I may gain for my draw the better. If it causes the attacker to flinch and look away my chances of survival are increased.
My belief is that in a case of survival anything that may increase the chance of doing so is worth using. My Father taught me that in a fight , cheat to win, there are no rules when it comes to survival.