Originally Posted by Richard_Siegel

Batter's Interference comes in two flavors.

1) BI where the batter interferes with F2 throwing to a base to retire a runner.

2) BI where the batter fails to vacate the area near HP when a runner is advancing to HP and the batter interferes with the defense making a play at HP and the batter.

In case #1, as long as the batter remains within the batter's box and makes to intentional movement to hinder the catcher's throw to the base, he is not guilty of interference should the catcher's throw accidentally hit him. The batter cannot be expected to evaporate nor is he expected to freeze. Should the batter choose to step out of the batter's box (even if his intentions are good, i.e. to get out to the catcher's way) should the catcher's throw accidentally hit him (while out of the batter's box) then it is going to be INT and the batter's intent to interfere is irrelevant. The batter had the "protection" of staying in the batter's box, but he chose to leave the batter's box.

The situation in your post is case #1. Even if the catcher did not catch the pitch cleanly and he has to go chase the ball, if the batter steps out of the box, the batter has a duty to stay out of his way to let him throw to a base. If the batter remained in the batter's box and was hit by the throw it would be nothing. However, the batter chose to step out of the batter's box and was hit by the throw. For this reason this is interference and it need not be intentional.