Click on the link below to access the Powerpoint slides for this lesson:
https://www.dropbox.com/s/j5nl74lgoi4te7c/Benefits%20of%20Focused%20%28United%29%20Prayer.ppt
Either they are each sending the Spirit which would be contradictory or they are the same person.
See John 14:26 and John 15:26, in one the Father is sending the Holy Spirit in the other Jesus is sending the Holy Spirit...
The Father, the Son and Spirit wills are unified but separate. That tension is everywhere in the scripture. Jesus prays to the Father. Father sends the Son
"I didn't come to do *my* will but the Father's will. Unity but different persons.