[SanDiegoSteve]

Originally Posted by GA Umpire

Then, he left the box which is part of the BI rule.

What I meant is, if he is just standing in the box and does nothing other than standing there(minus any time to react and move out of the way), then no INT is called. But, if he does something "unusual" (as JM put it), then BI is called. And, if he does something "unusual" for this call, then it would probably have been done with some deliberation.

Exactly what I was trying to say. I fully realize that intent is NOT in the rule, but you can judge intent rather easily and interference while standing in the batters box is usually intentional, otherwise the batter would just stand there and be a good boy.