[greymule]

If I believed that without the obstruction she would have tried for 2B and made it, then I'd award her 2B whether she actually continued to run (or trot, or walk) or not. If I believed that she would not have tried for 2B or would not have made 2B safely, I'd send her back to 1B. From the description, it's hard to tell whether this was a sure double or a single all the way. Keep in mind that, once the OBS occurs, she cannot be put out between 1B and 2B, even if her run to 2B seems foolish.

The coach was smart, telling her to try for 2B, since the worst that could happen was that she'd be sent back to 1B. She might have made it, and there was always the chance that the defense would throw the ball away.

I don't know whether the look-back rule supersedes obstruction—that is, whether OBS "does not pertain when another violation [LBR, in this case] is being played upon." For example, BR hits what looks like a single, rounds 1B, collides with F3, takes another couple of steps toward 2B, and stops as the throw comes in to F4. The ball goes back to F1 in the circle. BR, stationary, then retreats toward 1B and reverses direction or stops again. Is she out on the LBR, or is she immune because of the OBS?