I think that Tjones is saying that the MLBUM is not appropriate here since the BR cannot advance by rule since first base is occupied.
Also, with runners stealing and plays being made on them an immediate appeal really isn't possible. In the OC the appeal would come after playing action. The question remains, is it the second or third out? Common sense says that it would be the second, but this is rules, common sense may not apply.
I would be interested in knowing if there is a rule, case, or manual reference for this in any rule set.