User blog comment:Zathronas/Analysis by an author: Volume 2 episode 11: No brakes/@comment-3146930-20141024021616/@comment-10380701-20141024235606

Except Yang's semblance doesn't operate on the "slowly dry down" way. Again, Monty has referred to her semblance as a Super/Ultra Meter in SFIV. Activating it gives her an opportunity to throw a single powerful punch. Once she does that, then a portion of her semblance is used up. Even if it misses.

Considering her Semblance-empowered shot all the way back in episode 4 was blocked by Neo's parasol, it's safe to say that even a powerful punch will be parried. It doesn't help that Neo's own semblance can counter Yang's.

If Yang DOES hit Neo with her semblance, for example, Neo can just warp away before the hit and feint her out with a glass fake.