User blog comment:ChishioKunrin/Reminder: Weiss' Semblance is Glyphs, Not Ice/@comment-17099359-20141128203442/@comment-25195920-20141128222543

It could be a case of both semblences being similar or Weiss's semblance is more widespread than it appears, meaning that she has her glyphs and an affinity for ice. Or it could be a dust thing yes. It could also be an early animation thing as was stated before. Fact of the matter is, Weiss's semblance has been outright stated be her glyphs and the ice can be an extension of her semblence in another direction or caused by Dust.