User blog comment:Zathronas/Analysis by an author: Volume 2 episode 11: No brakes/@comment-3146930-20141024021616/@comment-10380701-20141025135026

le sigh

I'd like to repeat once again, her semblance is akin to a super/rage meter from SFIV.

It builds up energy once she's hit, or if she lands a hit, and she can save it up for future battles.

In the Yellow Trailer, we've already seen the full effects of her semblance.

By taking out the mooks in the first fight, she has built up the required energy to knock Melanie senseless with a semblance powered kick.

Once Junior chimes in and starts hitting her, she builds up more energy and proceeds to unleash a barrage of punches on Junior.

When her hair gets cut off?

She used her reserve to unleash the full potential of her semblance, delivering the Falcon Punch to end all Falcon Punches.

I don't get what's so hard to understand from that. Her semblance is actually so simple. In fact, it's so simple that compared to the rest of RWBY, it actually has very few clever applications as the resulting effects are straightforward. We've already seen what Weiss and Blake can do with their semblance through clever applications of Dust. Ruby, likewise, demonstrated some incredible feats with her semblance.

Yang's? Just get hit, return the hit, get hit some more, punch your enemies harder, go all out and slam them with brute force.