Board Thread:Speculation House/@comment-1860621-20140815015907/@comment-24219008-20140815025029

Also, the way I've seen it explained is that while Yang's Semblance allows her to "absorb" the energy from the hits she takes, it doesn't change the fact that her health is low.... It's like getting an extremely large adrenaline rush.... You feel strong at the moment, but after that buff wears off, you're completely exhausted.... If Yang were to take a seriously huge hit while still in Super-Saiyan mode, it could cause some serious damage to her.