Arwin probably knew that side of Ibelin already. He didn't even greet, talk nor spare a glance towards Ibelin. He's been showing hostile to Ibelin ever since Ibelin made this odd commanding and yet, fake emphasize of 'friend' to Latte. I've been rereading this comic to understand what's going on with Ibelin so I saw little details here and there in wording and expressions. The artist did such a great job subtly showing her other side while showing that Arwin already knew about it(?). Ibelin don't see Latte as a friend at all and you can tell by her behavior. But since Latte has been "getting attention," Ibelin probably thinks Latte is taking away all the attention that she wanted only solely for her. As for any back up of why I think Ibelin is like this. I have so many scenes I can point out. An example would be, she never asked Latte if she was okay when something happened to her in the past few chapters already and Latte even thought about it. One recent example is Ibelin already making it seems like Latte is a culprit by making this unnecessary statement of Latte could be the actual culprit while saying she must have a reason (that's a red flag!). And that I tell you, that is a way of manipulation to make herself, Ibelin, looks like a victim at the end. It's playing with words. I know this because I experienced it and I've done it before hahahaha. Yeah I still stand that Ibelin don't mean any good and have not see Latte as a friend at all. And Arwin knows it.
And what I love this one is that Latte has been slowly opening up to Arwin with no reserve on her words lately! It's really cute how she can just freely express herself while making jokes with Arwin🥺