Why kill it if there was no interference? This ball is alive if the batter did not step out of the batter's box and the PU has judged that the batter did not intentionally interfere with the return throw by the catcher. If the batter DID intentionally interfer with the relaxed throw back to the pitcher, then we have interference, kill the ball, call the batter out for interference under OBR 6.0-6(c), and return all runners to their TOP base. However, if the batter stepped out of the box and interfered unintentionally, then he's not out, but still kill the ball and return all runners to their TOP bases.

Leo