Batter out of box

[LLPA13UmpDan]

Well what brought this up is, I was the plate umpire for a major division softball game last sunday, and the losing teams manager (Who is clearly a hott head) wanted to argue that the opposing teams player was out of the box when she hit the ball. He wouldnt shut up about it, and even went and tryed to agrue w/ third base umpire about it. Also based on what i know, the foot has to be COMPLETELY out of the box, but her left foot was on the inner line and back foot in the middle of the box, which by LL book, the line is considered in the box. And thats what i told him. But if i woulda had to call it, I wasnt 100% on if the ball was still alive or not, since I couldnt find that part in the book. before the pitcher starts the delivery, we are told to make sure the batter is in the box.