If I had to choose just one, the second one. It's just that the conversation touched on both aspects at once, so I put two for one conversation. I'm fine with just one, though!

It's not so much just a part of the conversation as it is all of it. Akagi's encyclopedic knowledge means he knows about Calista's life as Escape, and that's what they were talking about. More importantly, the conversation centered on Enter's god complex, and hoe he killed Escape, which would be what the second one there is about. He mentioned it starting here