Board Thread:Speculation House/@comment-23844579-20130930053255/@comment-16502426-20130930060844

Yeah, that's been the general conscensus and a part of pretty much all theories about Blake being a Faunus. It looks like it is all going to turn out to be true, and there are multiple threads on it (specifically, the "Blake's Humanity" thread.

The song itself appears to be the story of the Faunus, specifically the White Fang.