1. That's a dead ball strike in baseball.
2. In baseball the runner doesn't have to vacate the bag, but can't intentionally hinder the fielder. I always look at intentional as meaning the player made a deliberate move, as opposed to didn't make a move. Of course the runner is only protected in this case from an interference call as it relates to the fielder - the runner is not protected from contact with a batted ball while on the bag.