Board Thread:Speculation House/@comment-1860621-20140815015907/@comment-25308133-20140824202415

Grimllock wrote: that probably had nothing to do with her sembelence, it was probably more so a warm up habbit, like cracking your nuckles or pounding your palm

Agreed. It's a common thing for boxers to do and Yang's fighting style is based on boxing. That's probably the reason for that rather then anything more complicated.