Another great episode! I can't believe they did a direct sequel to "The Library", that is awesome! I also liked that Korra became a little girl. And Iroh returns!!! Though the backup actor just does not sound good. I miss Mako.
Doesn't this raise a huge issue, though? If a human just decides to go into the Spirit World they become immortal? Assuming you can manage it. Why wouldn't everybody be trying to do this? And if you walk through the physical portal does this also happen? You'd think Unaloq would invade the Spirit World with his tribe or something.