Talk:Bloodbending/@comment-94.67.100.247-20120605163103/@comment-173.65.67.41-20120607032912

Yes Katara only used it twice in the original series, but it ended when she was what, 15? Who's to say she didn't pass on the secret, or at least the basics to others over the course of the next 70 years. I'm sure she told somebody, who taught somebody else, who probably wrote it down somewhere for Tarrlock to uncover decades later.