Hello
Had a scrimmage recently where an umpire called interference on batter. Runner stealing third, batters takes a step back on an inside pitch, still in the box. The catcher goes around and makes a throw to third. It was unintentional by the batter but it did look to interfere with the catcher. Batter called out.
I'm not educated on these things but to me it would seem if he is still in the batters box he wasn't doing anything wrong...anyone else going to drop by who is more educated?
The batter's box is where the batter conducts his business as a batter, but it's not his turf the way a goalie's box/crease may be in other sports. It's where he has to be when the pitch is delivered. It's where his feet need to be when he bats the ball. And it marks off a corner of fair territory where he is exempt from being called out if he is hit by his batted ball.
Other than that:
He can be out for interference if he leaves the box, as when his swing carries him over the plate when a runner is stealing second.
He can be out for interference if he moves somewhere within the box unnecessarily, as when he steps back and gets in the way (either intentionally or not) of the catcher's throwing lane on a steal of third.
He can be out for interference if he stands still like a statue within the box, as when there is a steal of home and the pitcher steps off the rubber and throws home.
He's allowed to do his business as a batter, but the defense is also allowed to do their business. That consideration often matters more than lines marking the box.
Does this help?