User blog comment:IamThorn/Why Yang Lost/@comment-25411051-20141030193357/@comment-5217560-20141030201413

^^^Basically. Also, Neo is a much better fighter, she was really only toying with Yang in this battle. Yang didn't use her Semblance most likely because she was aware that it would be no use, since she can't even land a hit on Neo.

As for aura, we know that it's depleyed during battle, so like you said, Neo made calculated strikes at vital points that drained Yang's aura even faster, allowing her to be stunned.