Poppy and Lao Bei Fong giving their lives to ensure Toph could hide and survive the Water Nation's attack on their home, even giving up a chance at hiding themselves to ensure she would be safe.
Aang telling Azula that he never blamed her for his Azula's deeds, that he wanted to help Princess Azula as well, and that he needs her as a friend. Azula begins sobbing from what he said.
Aang meets the version of himself from the Distorted world, whose body and destiny he took over. The latter bears no enmity towards Aang whatsoever for the circumstances.