Alrrrrrrrrrrrrrrrrright. Look, saying speed was never her semblance is plain wrong because because up until V4, her semblance has been a basic speed semblance. THAT BEING SAID, Pyrrha isn't omniscient. As far as she's seen, Ruby's semblance has just been speed, so that's what she called it. Now, one of two things is happening. Either it's still just a speed semblance and their just being more artsy about it, or semblance, as speculated, change and developed as the user becomes more adept. Both are equally possible. The latter would make more sense, yes, but it's also Rooster Teeth. I would not be at all surprised if it's simply an artistic choice.