User blog comment:Zolnir/RWBY Episode 8/General Reviews & Speculations/@comment-17099359-20130907023540/@comment-17727644-20130907053105

I fully agree. Ren was fighting the most and most likely has the lowest amount of Aura avaliable in the group. Also remember that Aura's amounts vary by people. Pyrrha said that Jaune had amazing reserves of Aura basically. Which is a basic assumption is that Ren could not have very much Aura to use to begin with on the oppsite end of the spectrum. If he doesn't have amazing amount - then he will get tired more frequently after using aura and will need to replenish it more often. Ren may simply have the lowest Aura availible to use and thus becomes winded/tired easily. He can take a hit, he just doesn't have the Stamina for long-term engagements. He needs to end battles quickly and precisely becuase of his lack of Aura.

I think while Zolnir is right in many regards; he maybe digging a bit too deep. I feel like he nailed on the head many aspects of Ren/Nora's past from a psych point of view, however I'm not sure if will translate properly to the series when eventually we do hear about their back point of view.

Ren strikes me as an introvert and while Nora is definitely the extrovert - it could be what you see is what you get for both of them. Ren could simply be a professional - get in, do whatever, get out type of person. Nora is just being plain silly because she wants to have fun. Nora certainly didn't have the tactical sense to dodge at one point which is why Weiss had to save her. So While Nora seems to be strong in combat, I don't get the feeling she's actually... an tactician or smart about what she does in Combat. She just does what feels is correct for the situation.