obstruction???

[greymule]

I was simply following the progression from:

1. the OP, which follows strict ASA, where the runner altering her stride before the fielder has the ball means OBS and the runner is safe, to
2. runner alters her stride but would have been out anyway, which according to at least one ASA authority results in an out, not OBS, to
3. Babe Ruth/OBR, in which OBS is under some circumstances disregarded; under these codes, OBS is also not necessarily a delayed dead ball

And NCAA, in which a fielder in the immediate act of fielding a throw can, without the ball, get in the runner's way without committing OBS.