In the Airship, White is shown exiting a vent. He then sees Yellow being followed by BF and GF, who think Yellow is another Impostor. Yellow and BF both have the same task: to sing the first song of the week, leading to just that. Girlfriend is still suspicious of Yellow, who again states he is NOT the Impostor. The second song starts. As the song ends, Yellow is killed by White, who while in the cutscene before Oversight, then seemingly has an argument with BF before going to where Yellow once stood. Girlfriend complains that she wants everyone to be friends, so BF tricks White into thinking he'll actually do that. The third song then starts. White and BF are left staring at each other until Black comes and punches BF out of the window before chasing him outside the Airship. Boyfriend presumably makes his way to the Cargo Bay, where White and Black both find him leading to the final song of Yellow's (And to an extent, White's) Week. As the song ends, Boyfriend and Black are both sent to the Defeat Screen. It's possible Black himself teleported them here so Black can fight BF one-on-one.