Board Thread:Speculation House/@comment-1839918-20160301193534/@comment-4010415-20160302130815

Here's a link to the source of Miles and Kerry telling us straightup that what happened was


 * Yang had already been fighting, so her Aura wasn't at 100%. (Remember, she ran into Grimm while talking to Blake on her Scroll and had to hang up, and then we saw her fight White Fang members outside the cafeteria)


 * Adam's attack was so strong that it depleted the remainder of her Aura and was too much for the Aura she had left to completely protect her from.

Miles even went on to say that the scene showed that Adam is really strong.

In fact, here's a transcript:

Miles: Y'know, we establish in the [...] tournament fights that, like... Yeah, every hit can drop it and some hits can break it. It just so happens that Adam's attack was so badass that, in one hit, it managed to break it and do damage all at once, it was so powerful.

Kerry: Yang had also been fighting off-screen.

Miles: Yeah, exactly. Yeah, that girl, that girl had been through some things! It's not necessarily a sword thing, more just like "Oh, he's strong! Oh, he's a scary man!"

Let me point out that Miles said "It's not necessarily a sword thing, more just like 'Oh, he's strong! Oh, he's a scary man!'"