User blog comment:Maki Kuronami/Lesson 40: "IT WAS ME CINDER! IT WAS ME ALL ALONG!"/@comment-5217560-20160215042602/@comment-10380701-20160215043121

Honestly, it's fine if Ruby did pull a Deus ex machina. The main problem is the execution of it in this episode. The Deus ex machina was too sudden.

Compare and contrast ATLA's first season's ending where Aang goes Kaiju mode with the Water Spirit.

I feel if they extended the scene to take a bit longer, it may have been fine. Instead she saves the day offscreen.

Ruby has a chance to die as well, it's just at 1% right now. As we get further into the series, it's gonna rise until she has a death flag over her head like Pyrrha before her.