A runner may not make malicious contact with a fielder, whether the fielder
is in or out of the base path, or whether he has or doesnt have the ball.
Penalty: Interference: The ball is dead, the runner is out, and other runners
return to the bases occupied at the time of the interference. If the interference
prevented a double play, the umpire will award the second out.
Note: The OBR has no such rule. The NCAA has a similar statue called the
Collision Rule.