[AtlUmpSteve]

Is that different from the third base coach that repeats the mantra to his runner on third, "Down in foul, back in fair"?? You do know why they come back in fair territory, don't you?

In both cases, you have a runner doing what they can legally do, and not doing anything they cannot legally do. If you want to create a judgment based solely on what you have described, where would you draw the line?

Unless the batter-runner looked back to see the throw before she changed her lane, I have nothing. And you are starting a long slide down a treacherous and slippery slope if you are seriously considering that you need to judge and even consider the intent of players doing completely legal things on the ballfield.