User blog comment:CaveJohnson333/RWBY Characters Hurt/Heal/@comment-25555436-20160215000742/@comment-25555436-20160216001331

^It's not so much the powers what bother me (they make Ruby feel very Mary Sueish but that can be rectified). It's the Deus Ex Machina what bothers me.

There was no real foreshadowing or hints towards that being at all possible and the closest we have to such are stretches, it happened suddenly without any buildup, and happened to stop both Cinder and the Dragon at once, saving the day by sheer power of miracle.