If the low spots, the serrations, are sharp and since flesh under the pressure of penetration will compress into the the surface of the blade, the serrations give the blade more cutting surface, not less. The part I am stuck on, it only penetrated up to the ferrule and then bounced back. Sounds to me like a ferrule problem. I shot an old style Bear through a car once, no ferrule problem there, of course in was only a double rear fender hit not a barrel. (Just playing with ya, Stingers are fine broadheads.)