There are many shades of grey in this.. that's why there is always a lot of discussion and often no clear cut "right" answer to this kind of call. In the end it's our judgement..
Sure the batter's box is a haven but it is not absolute. As some have stated once the batter starts to move after the pitch is over she may be guilty of interference even if she is trying to get out of the way.. on the other hand at some point after a passed ball failing to vacate the batters box and the vicinity of the plate may itself be cause for and interference call on the batter who has not moved a muscle since the pitch. In once case she is out because she moved in the other she is out because she did NOT move.
Shades of grey.. F2 drops pitch and it lands at motionless batter's feet, F2 moves forward and grabs ball contacting batter who moves (or is moved) back a bit by this contact and F2 comes up ready to throw.. probably nothing. Same thing but batter pushes back at F2 and perhaps takes away a chance for a play probably INT... same play but ball roll thru batters legs and F2 has to go around motionless batter to get the ball probably nothing.. but iif batter moves and F2 and batter start doing a dance trying to get out of each others way.. hmmm.. could be interference.
This is why we get the big money.
