Board Thread:Episode Discussion/@comment-410526-20160206155158/@comment-26872876-20160206205927

The Hyoudou Issei wrote: Silent Mocker wrote: The Hyoudou Issei wrote: Well, what did yang expect, Adam was 1. Armed and dangerous 2. Handy with a sword. Yang probably wasn't thinking much her only concern was to save Blake  True, but on the other hand, her aura really shoulda protected her there

It really depends. Yang's aura level, the damage increase of Adam's slash, and Yang's semblance all factor in on what happened. We just have to assume some combination of the three cost her an arm.