I'm not sure "fair ball" is the definition I'd use for "successful bunt." Afoul bunt is just a strike. If you are only bunting strikes, which you should be, a foul ball is no more harmful than taking the pitch for a strike, no? For that matter, A foul bunt may do just as much good as a fair one in forcing the defense to defend against bunts. And I think bunting against a shift is different--easier--than bunting against a standard defensive alignment, and much easier than bunting in a sacrifice situation, where the corners might be 60 ft from home plate as the pitch is delivered. So I'm not sure how helpful this article is. Yeah, bunting is hard, and may take some practice. So is swinging away.