Oklahoma/OkSt. game on ESPN the other day. Runner on first. Runner steals second, batter swings through the pitch and his bat hangs directly over home plate on the follow through. Catcher pops up and cocks his arm to throw down to second, but instead turns away without attempting a throw because he would have been gunning his hand directly into the bat.
The umpire sent the runner back to first, recorded the pitch as a strike, and allowed the at-bat to continue.
Was this an option or should the ump have had to chose between a) calling the batter out and sending the runner back and b) allowing the runner to stay at 2nd for the catchers failure to attempt a throw?