here's how it would go down :
Paul sings 'Get Back' and looks at Yoko. John sees it and stops playing. He then asks to start the tune again, but before they count it off he gives a sarcastic monologue directed at Linda who is sitting in proximity. Paul tells John to lay off and John insults Paul. George is shaking his head and looking at Ringo. Paul grabs his glass of wine off the speaker cabinet and tosses it in John's direction. John walks over a kicks a hole in Paul's speaker and gets his foot caught and falls backward into Yoko who was following behind. They both tumble to the floor.
Paul is laughing, and John gathers himself, gets up and rushes at Paul, who still has his Hoffner bass strapped on. Paul turns and rams the bass neck into John as he attacks. The bass neck snaps but is dangling because of the strings. John is hurt and George and Ringo intervene. George is talking to John and Ringo is talking to Paul. John then starts on George because he knows he banged Cynthia.
George insults Yoko and then they start throwing punches. Paul just watches as Ringo tries to break them up along with Mal Evans. Ringo gets punched by someone and he loses his temper and starts throwing punches into the heap of bodies. Paul is still watching, but also looking at his ruined bass, which he loves dearly. He takes off his bass and tries to stop the fighting. By then things have calmed down and Paul grabs his broken bass and tosses it in John's direction and says, " just like this bass, you broke up the band." Paul exits the room.
John is still yelling obscenities, while George, who is bleeding from the mouth, exits. Ringo is standing there looking at John and Yoko. John shakes his head and smiles and starts counting off 1,2,3,4 as if ready to play again. Ringo smiles a sad smile as he wipes the blood from his lip with his shirt sleeve.