"Ihey're special to each other, then. I hope they can reunite soon." Billy reflects on this new piece of information. So this person who was probably Katara's beloved had been helping them from elsewhere, and she knew he was there but couldn't reach him. That had to be disheartening.

Closing his eyes and thinking for a moment, Billy ponders the situation. "We can't all fight the Nightmare King directly, but I've gathered that we'll be able to resist him in other ways. By facing our fears."