What I've heard
One of my colleagues who was trained in the 60's mentioned the other night that his school gave a reason for the mechanic.
Basically, the idea is to double-check the PU. If he signals "foul tip," but the ball is on the ground, then the BU could signal "foul ball." I can see how this might prevent some mistakes (by a sloppy PU) on strike three or runners moving, but I'm not sure how valuable the overall mechanic would be. And today, we don't look for mechanics designed to cause one umpire to "overrule" another.
-LL
|