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People being unconscious or otherwise out of it while important stuff happens are a fun source of amusement in movies and stories. Unfortunately it doesn't work so well or easily in a game. Most players won't like their character being on the side lines for any length of time. Effects like paralysation or mind control can be real downers, and can also feel like taking agency away.
If you can turn it into a role-playing challenge with the player on board with the situation, like Sally here, things may work better.
Commentary by memnarch (who has not seen the movie)
Huh. I wasn't expecting to be accurate with Babu getting talked down and fixing Threepio. Well, probably anyway; there's not any way for me to guess at what the actual movie plot was at this point, but it does look somewhat close. Otherwise this whole diversion would have been to just turn C-3P0's eyes red for a little bit for no reason. And also have the small chat outside looking at the city. Which, okay that's random and unexpected, but not exceptionally flashy or interesting. And most of the other characters in the scene seem rather bored as well.
As for the rumbling, that's gonna be the First Order of course. Air dropping a Factory that turns out to have been faked seems most likely, at least from the comic point of view. A more intense form of the door knocking seen at the start of the scene on Kijimi? Delivering packages only goes so far, and wouldn't fit the movie either.
Transcript
C-3PO: {robotic voice} Oh, do cheer up. Your revenge has already been achieved! The corpses of Han, Luke, and Chewbacca rot, while your genius lives on.
Babu Frik: True...
C-3PO: {robotic voice} Well, Luke peacefully transcended corporeal existence, and Chewie got ionised instantly without suffering, but, good enough, right?
Babu Frik: I... suppose...
C-3PO: {robotic voice} And the best part: You have the most plausible deniability. You cannot stand accused. Not a soul ''knows'' the triumph of your vengeance. Your magnum opus is... ''Already. Forgotten.''
Babu Frik: Nooo!!! Cease thy blathering, insolent homunculus!
GM: Babu fiddles with 3PO’s circuits again.
Rey: Wow. That was evil.
C-3PO: {robotic voice} I know.
[SFX]: klik
C-3PO: {robotic voice} <beyoooo...> {turns off}
Babu Frik: Why must my existence be naught but an endless crucible of torment!? Every black-hearted rogue feasts upon the luscious fruits of their villainy, whilst I alone am condemned to gnaw only the bitter rind!
Babu Frik: Even entombed in the writhing gut of the Rathtar, I felt some phantasmal conspirators of malevolence abiding by me, hungering, yearning for the hour to erupt in new depths of dizzying depravity!
GM: The sky splits with a deep rumble. Something vast approaches.
BB-8: Oh, thank goodness. An actual plot hook.
Finn: I was afraid we’d be stuck in Babu’s existential crisis forever.
[SFX]: klik
C-3PO: I say, what happened? This seems like a delightfully convivial gathering!