Hn. [ Sasuke thinks about it for a moment, before giving a nod to confirm his own hypothesis. ] That doesn't sound like you are transferring your life force. It sounds more like a genjutsu— an illusionary technique that can do anything from placing people under paralysis and forcing their consciousness into hallucinatory worlds, to allowing you to enter and even control the mind and body of another. The blood powers may be what is causing it to happen unintentionally, which makes it slightly different than the practice I've grown up with, but I believe that the basics of it would be the same.