User blog comment:Zathronas/Analysis by an author: Volume 2 episode 11: No brakes/@comment-3146930-20141024021616/@comment-17099359-20141025000409

The thing is though.Neo has shown to be able to not only block but dodge Yang's attacks as well.

I mean yes she would have had a shot if she used her semblance. But if she missed she's would be in worse position than if she hadn't used it.Not only would she had wasted a powerful attack but also now as less in the tank that she could have used later down the road.

At least that's how I understand it