"I could have brought them back," Katara explains, desperate and oh-so-reasonable, her grip on Sokka's fingers tight. "I was going to - I was going to find out how, I just - I just needed to keep me alive to do it, but I could have, you know I could have! Everyone would have been all right!"

It's so perfectly logical, so clear in her mind. It's what she had to do - what she still has to do!

"I could have healed them!"