Ryner seems to have some kind of personality disorder and switches between his mankind-friendly soldier persona and his titan warrior one. He seems to remember an entirely different version of the recent events, and Bertolt has to remind him of who/what he is.
Elen unsurprisingly yells at Ryner and Bertolt for what they did five years ago, and that accomplishes about as much as you'd expect.
It gets more interesting when Ymir joins the conversation.
First off, they're waiting until it's dark to move, so titans won't be an issue. Ymir points out that titans could move in the dark just fine back at the fortress, and she's told "yes, and those here can't, you should know that, really".
Ymir asks Ryner about "the monkey". Ryner acts like he doesn't know what she's talking about. Ymir explains that the monkey / beast titan is the one who caused all those titans to appear within the wall and its objective probably was reconnaissance-in-force. Ryner and Bertolt's "home" is where that beast titan is, which is why they looked so elated when they saw him back at the fortress.
Ymir says she has her own reasons not to tell Elen everything, but at the very least, he should know that defeating Ryner and Bertolt wouldn't solve much in the end. Ryner interrupts her as she's about to tell him who they true enemy is (it apparently begins with "se"... "seifu" / "the gouvernement"? "sekai" / "the world"?).
Ryner points out that Ymir is betting on the wrong horse by allying herself with Elen. And while he can't ensure her safety once they're all back "home", he might be able to do something for Christa.
When Elen asks Ymir again about their real enemy, Ymir dodges the question. She's apparently been convinced by Ryner.
The beast titan wasn't actually revealed to not be human (i.e. he's called a monkey, but that doesn't necessarily mean he is), nothing about Christa not loving Ryner back, nothing about Bertolt being proud of what he did, nothing about the beast titan planning to attack the wall with an army of titans (although I guess that might be what the reconnaissance was for), nothing about Ymir being in on it and insulting Ryner for forgetting about that.
(just saying this to fuck with brokasten lol).