[AtlUmpSteve]

I'm going to utilize the most equivalent rule in the book to determine how to gauge when the baserunning is complete; the "abandonment" rule. In both NFHS and ASA, that means the runner has entered dead ball territory (and includes the batter-runner on a hit-by-pitch); prior to that, the runner may still return to complete baserunning.

As to the alternate play added in, it could be me, but I'm just not ever granting time for a runner to dust off. I see no legitimate reason why the runner cannot do that while maintaining contact with the base with the ball remaining live. I'm surely not killing it so a runner can safely return after missing a base without violating the lookback rule or be subject to appeal for missing; I believe that gives an unintended advantage to the offense.