My favorite scene involving Moiraine and Lan has to be in the beginning of The Fires of Heaven. There's a point where they discuss why Moiraine has chosen to follow and help Rand, and they talk about some of the ways that she could have acted but how they would have ended horribly. It's interesting just to get that secret and manipulative Aes Sedai view from Moiraine, we're not used to seeing it to that extent in her. Lan looks to her as to what will happen to them and it's fairly tense. There's also a moment where it's mentioned that Moiraine has arranged for Lan's bond to be passed to Nynaeve, which is both sad and sweet. And we know exactly where that's going.