This is the only significant interaction between Paul and John throughout the session. They sing two choruses and a middle eight before an instrumental break. They resume with another middle eight, followed two more choruses. Paul's drums have been faded out of the mix at this point. Paul and John then sing a middle eight acapella, followed by another chorus and instrumental.
Someone picks out the chords to a slow ballad.
The band tunes up. The band tries to play the riffs. OK OK OK, you get it, you get it good. You suddenly turned the voice off and one ear off. Get us a drink.