Yakov l- if you pour FIRST, before drinking, after the bracha, then its not pagum. if you make a bracha and then drink and then pour into cup b its pagum. if you drink from the same cup after the same bracha, its ok.
and you mixed up what i wrote- the MB is mifurash.
If you pour into another cup- cup b- the wine in b isnt pagum and doesnt need adding. once a cup is drunk from, it becomes pagum. clear enough?