Board Thread:Speculation House/@comment-14138255-20140815002519/@comment-11188061-20140821233905

That last reason was unnecessary. And sure, maybe we could've understood things better if they had spent a few seconds longer explaining it, but obviously RT is trying to avoid doing that. One of the greatest flaws in anime is the unexplainable pause between battles where the combatants suddenly spend their time explaining exactly how their power works, which is just plain illogical. Obviously Yang isn't going to tell Torchwick shit about her powers, so Ruby and Blake and up for the job. That and they are in the heat of battle, so for the occasion the wording was simple and precise.

That being said, I'm surprised no one actually realizes about Yang's semblance after a full semester. But that's probably they didn't actually try to hurt each other when dueling and training, and that a forming a strategy on getting Yang hurt use her Semblance is tasteless for Ruby.