Board Thread:Speculation House/@comment-3146930-20140708014442/@comment-3146930-20140725004643

Emerald implies that he made a promise with the White Fang that he couldn't deliver on. Emerald also mentions his "brothers in the White Fang," which is what Blake calls them in the previous episode. It is most like a symbolic title, meaning that all members of the White Fang are brothers and sisters.