Board Thread:General Discussion/@comment-210.4.98.158-20130906173718/@comment-120.28.234.10-20130925200559

I think its simply just the animation, sort of like an exclamation mark over the head (its the bow in this case) to indicate that something was coming. A better example would be ears twitiching in Anime, especially the comedic ones (Hint: this show isn't dark, yet). The effect of "twitching ears" in anime serves two purposes:

a. It serves as a visual representation that the character hears something

b. the sound is too low for us to hear, but is present anyway.

Its not like this show was dark/serious to begin with which was what I was hoping/expecting, so I'm more likely to believe the movement as such. Also, her hair was seen moving in the same episode when others, including Yang's (who was furious at the time), weren't.