Board Thread:Speculation House/@comment-14138255-20140815002519/@comment-11188061-20140822022116

Because there's no need to until then?

How to put it? You have a secret that's not quite secret, and it's not yours so it's not really up to you to say about it unless necessary.

Yang's semblance is obvious. Get an instant boost whenever she gets emotional or puffed up or whatever. The hidden attribute of 'if I get injured, I get stronger!' never really comes into play, because even if there's a slight difference in the Semblance strength, Weiss and Blake will probably put it off as Yang getting pissed. Since Yang never bothered telling any of it herself, and Ruby don't see the need to suddenly dump info on her teammates, they continued like this until the fight with Torchwick.

Like c'mon, don't tell me you know everything about your friend. You can work with a colleague for years and don't know where he lives, or how many kids he have, or if he's even married. Your wife might have a Swiss bank account and a billion dollars, but she just never told you since the family never needed that money. So?

So when Yang got hurt, it just happens to be the right time for Ruby to tell Blake that she doesn't need to worry, Yang will be alright. Again, it's a secret-that's-not-a-secret thing, so.