[Andy]

Greymule - The case play that you cite is not really applicable to the situation at hand. In the case play, you have runner rounding third, obstruction, throw which places runner in a rundown. Due to the obstruction, the runner cannot be put out between third and home, but the runner stays between third and home for the entire rundown and it is all part of the same play.

I see the scenario presented as similar to the play where a BR hits the ball to the outfield, is obstructed between first and second , slows up or stops at second, but then attempts to take third because the relay throw is misplayed and is thrown out at third. The effect of the obstruction is over when she reached second, her attempted advance to third was the start of a new play, so to speak.

In the scenario presented, I believe the runner started a new play when she reversed direction to return to first and that the obstruction is no longer relative to the play.