Batter-Runner Improperly Advances on Dropped Third Strike
With the bases loaded, one out, and a 2-2 count, the batter (B1) swings and misses at the next pitch. The catcher drops the third strike, so B1 immediately starts to mistakenly run to first base. B1 was not entitled to attempt to advance since there were less than two outs and first base was occupied when the third strike was not caught (NF 7-4-1b).
The catcher retrieves the dropped third strike, but throws wildly into right field. At the end of playing action, two runs have scored, a runner is on third base, and the batter is on second base.
The defensive coach argues that B1's improper actions started the play and all runners should be returned to their bases at the time of the pitch (with B1 called out on strikes). The offensive coach is delighted with the results of the play.
What do the umpires do now?