The boy doesn't immediately take her hand. Instead, his face immediately changes from a smile to a confused frown, his brow furrowing.

...There is no way this can be good.

"Uh, good to meet you, Korra." He tightened his grip and took her hand in his, though his palm looked minuscule and bird-like next to hers. "I'm Aang. I'm also the Avatar. So... I got you too?"

Welp. If she knows about the Air Nomad culture, she has to be from the past. There will be no comfortable way of explaining his utter failure to his past life.