Talk:Adam Taurus/@comment-29933641-20171026011933/@comment-4010415-20171026012358

According to Miles and Kerry, the reason he was able to cut Yang's arm off is just because his Semblance did a huge amount of damage that was more than her remaining Aura could block, especially since she had been fighting off-screen.

So, I don't think he can just cut through Aura or bypass Aura. Sienna's death really would've made more sense if they had just had him use his Semblance to at least break her Aura and then stabbed her in the heart.