I was on the plate Sunday and had waist high slider come in on a lefty on a 2-2 pitch. I followed the pitch in, because it was VERY close to being a strike, and thought that I also had the checked swing covered well. I said ball. Catcher asked for an appeal. I went right away, still thinking there was NO WAY he went after it.
BU rang it up (long time Pac 10 ump). After the game, I asked him how close it was, he said "Not close at all, he obviously offered at it".
The moral of the story is, I ALWAYS go for help when the defense asks. I can be so sure I have it right, but obviously, I don't always!
I go regardless of what rule book I am umping under. It is a curteous thing to do, and provided that it doesn't make a mockery of the game, I see no harm in "getting some help".