Board Thread:Speculation House/@comment-34553226-20180516224055/@comment-4010415-20180516234718

By "magic-user", I assume they mean Cinder? Because it seems that Cinder was a special case, and Ruby's Silver Eye powers don't actually affect all Maidens that way. If they did, Raven would've been hurt as well, considering that the Silver Eye powers aren't limited to affecting only what's in her field of view. If they were, she wouldn't have turned the dragon Grimm to stone. Cinder was affected, first because she may have had that Grimm beetle from the glove she used inside of her, and then because she had a Grimm arm.

I think a lot of us are hoping that, if/when she does get control of her powers, they won't actually be as powerful as they were at the end of Volume 3. That event could've just been more powerful due to the powers bursting out of her all at once for the first time. Though, there does seem to be a downside to her using them at such high power - she loses consciousness for at least several hours immediately afterward. (The second knockout in Volume 5 was due to Emerald hitting her in the head to make her stop before she went full power)