"I can't really see what "scrambling back to a (forced) bag has to do with it."
"B is the correct answer as R1 acquired 2B when he slid past it, therefore removing the force at 2B. It can't be an appeal for a missed base as the base was not tagged; F6 tagged R1 not the base. Since R1 acquired 2B and R3 scored before the third out was made, the run counts. "
It is called
continuous action by J/R. Most umpires understand this situation very well.
