User blog comment:Zolnir/RWBY Episode 8/General Reviews & Speculations/@comment-17765263-20130908002826

I personally don't think Ren is weak, but he could've exhausted himself by using his aura. I mean when pyrrah used her aura to unlock jaune's she was tired too. However, Ren was in the middle of a fight with 2 enemies so that couldve been physically taxing and also lead to the reason he relied on Nora to distract the Nevermore.