UmpTT,
I've always preferred the "cleaner language" of the NCAA rule:
	Quote:
	
	
		| (2) If the improper batter becomes a base runner or is put out and an appeal is made to the umpire-in-chief before a pitch to the next batter of either team, or a play or attempted play, the proper batter is
 declared out and all runners return to bases held before action by the
 improper batter. ...
 | 
	
 It plainly state that the improper batter completing his at bat is what matters, and does not even indirectly suggest the umpire tread the slippery slope of causality. 
I believe the OBR rule "means" the same thing, but I can't prove it.
JM