Episode 9 as a whole. They're having dialogue explicitly for the purpose of explaining certain bits.
For one thing I'm wondering why on earth Popo didn't just kill Kichi right there when he was trying to tell Neiro the truth? Then he wouldn't have to force Neiro to stick with her modified thoughts. I felt kinda uncomfortable during the whole "Don't shoot him! He's your lover" scene, it felt like it dragged too long (who am I to make any comment though.)
And is Popo making Neiro do all the dirty work (particularly shooting Kaiba) because he wants her to suffer, suffer and suffer? Because otherwise I don't see why Popo would purposely want Neiro to deal with Kaiba... It would have taken much less time and hassle if Popo himself had done it.