[greymule]

I thank everyone for their thoughtful responses. I can accept the argument that because Abel had no chance for 2B at the time of the OBS, his protection extends back to 1B only. After Abel recovers from the trip, as soon as he does something other than try to return to the base he would have made (such as run toward 2B), his protection ends. Abel is out at 2B unless I am certain he would have made it absent the OBS. I don't try to discern the effect of the interruption of the flow of the play.

In the BRD play, if Santiago had continued toward home after the OBS, he would have been liable to be put out. He was protected back to 3B only if he did not try to advance.

This starts to get into territory covered by the J/R, which describes situations in which it recommends ignoring OBS when it has no bearing on the play.