Interference is an illegal act by an offensive player that hinders a defensive play. This most commonly occurs when a runner gets in the way of a fielder catching. The umpire will call the runner out and stop the action on the field immediately. This rule ensures that the defense has a fair chance to record an out on hits. A runner accidentally bumps into the shortstop who is trying to scoop up a grounder. The umpire blows the whistle and declares the runner out for interfering with the fielder. This can also happen if a batter hits the catcher with the bat during a swing. Players must remain aware of their surroundings to avoid physical contact with the opposing team. Proper base running paths help minimize the risk of being called for this specific violation.