With R2 on second, R3 on third and two outs, B5 has a 1-2 count . B5 swings and misses at a pitch high and inside. The pitch hits B5 as he swings at it. The catcher is unable to field the ball cleanly. B5 starts to run toward first and the catchers throw sails over the first baseman's head into right field. Both runners score and the batter-runner ends up on second base.

  

WHAT IS THE RULING?