If the runner was in contact with the base when hit, dead ball award batter first all other runner stay where they are unless forced, if it was a fair ball. If foul, foul ball. If the ball pasted f5 and no other fielder had a play. Live ball, play on. If f5 was playing behind the base which is unusual in fast pitch or f5 didn’t have a play on the ball, your judgment, dead ball, and award batter first and the runner is out.