In which case the energy and momentum of the arrow shaft is not going to be directly behind the point of the mechanical head and that will limit it's penetration. And the guy at the pro shop should be hung by the gonads with his own bowstring.
Agreed...but at least it will hit where he was aimin'.....
I just love getting you going Arthur. You know how I really feel about this issue but it is nice to get the folks that are die-hard exposed blade shooters going when they get all serious about the heads they use....