User blog comment:Zathronas/Analysis by an author: Volume 2 episode 11: No brakes/@comment-3146930-20141024021616/@comment-3146930-20141024022755

I rewatched the fight a few times and even downloaded the video so I could slow it down in VLC. Yang's eyes never turn red which is usually a sign of her Semblance, but it should have been working as Neo managed to cause more damage to Yang than the Malachite sisters did. Only thing I can think of is that Neo knocked her out before Yang had a chance, even if her Semblance should have activated sooner.