Board Thread:Speculation House/@comment-131.123.61.0-20140416144504/@comment-3146930-20140623194847

But most of this only applies if Semblance isn't allowed in the fight. Some people may not notice if they are using a Semblance at all. Ruby for example is very fast, but she may not know she is fast as a result of her Semblance or the other person could accuse her of using it.

Plus if everyone has a different Semblance, it is possible that you don't want to be the first to use it because now the other person knows what to look for. It would mean the other person knows what your ability is and you are left in the dark on theirs.