Yes, he did. The day he arrived was one when Acumen wasn't working properly. Many people arrived suddenly and disappeared the next day. Sokka and his friend were two. I believe the other was called Zuko?
[She doesn't mind the brutal honestly. Cosmo understands that her attitude isn't helping her much with things like this] I know...I just don't know what I can do. [She always ended up getting her friends hurt at home...]