Interference by the Batter
Many people believe the batter's box is a safety zone for the batter. It is not. The batter may be called out for interference although he is within the box. The key words "impede, hinder, confuse or obstruct" apply to this situation.
An umpire must use good judgement. The batter cannot be expected to disappear. Most believe: if the batter has a chance to avoid interference and does not, he is guilty. If he just swung at a pitch or had to duck a pitch and is off-balance, he cannot reasonably be expected to then avoid a play at the plate. The batter should always be called out when he makes contact and is outside the box.