Can't find a case play

[youngump]

Originally Posted by MD Longhorn

Runner on 2nd. As the pitcher starts her delivery, the batter abruptly steps out of the batter's box (without calling time). The pitcher stops her motion and fails to pitch.

I know the ruling (No pitch and warn the batter)...

But I know this has been a case play somewhat recently and I can't find it. Any help?

I'm curious why you mentioned the runner on 2nd. It doesn't seem to do much to the play. Perhaps you meant to have her step off just before the pitcher finally stopped. In which case it is somewhat more interesting.