After the interrupted execution scene…
Stormtrooper: “What are you doing down here?”
C-3PO: “I am a highly-trained Resistance spy.”
Stormtrooper: “Right. And I’m Jabba the Hutt."
[PEW!]
Or simply:
Stormtrooper: “Then why ar- wait, what?”
[PEW!]
Honestly, while it is a little naff that 3PO references the Resistance post-mind wipe, it’s hilarious enough that I might be willing to overlook that. And I suppose you could hand-wave it with “Poe told him about the Resistance and the First Order on the way to Kylo’s ship so that he’d be on his guard…but then he mixed up which side he was supposed to be on.”
EDIT: Or just use the clip where he says “It appears I am a highly trained Resistance spy.”
And dzabdehat, fantastic job extracting those clips!
EDIT 2: Oooh, man, there are some audio clips in that folder that could work really, really well with Jannah. I’m going to have a lot of fun playing with the scene tonight.