User blog comment:Darkcloud1111/Good Idea, Bad Idea-Best Day Ever/@comment-2006510-20140726042645/@comment-3146930-20140726215634

Sorry, I think I misread your post. It was like 5 in the morning and I just woke up. I was just checking my computer before getting ready for work.

Obviously as shown by Ren, if focused enough in a single spot (like around the hands as he does), it makes a very strong, possibly unbreakable shield. However this may require strong focus as when he is surprised or distracted, he never does this and usually gets slammed into a wall (once when getting flung off the Death Stalker and once when hit midair by the King Taijitu).

However Aura in its natural state seems to act as a full body shield (judging by how it looks when Pyrrha unlocks Jaune's), so all that power is stretched out over the body instead of being in a single spot; meaning more area is covered, but there is weaker protection. So you are basically trading more area for less power, while Ren seems to trade less area for more power. Obviously with enough training the other could learn this (unless it is like a special technique passed down in Ren's family), but none of the others seem to use it this way (except maybe Cinder; unclear), leaving me to assume that their Aura is in full body mode all the time.