Board Thread:Speculation House/@comment-64.113.177.152-20150121173112/@comment-4010415-20150328075425

World of Remnant: Aura while displaying a silhouette of Ozpin: "With enough training and focus, a user's Aura can turn them into something much more than just a man."

I dunno, that seems to imply it's due to his Aura, not his Semblance. Like he's some kind of master Aura monk or something.