It's anything but barraging. It piques Annabeth's interest, which means Korra's probably about to suffer at least some variation of the Annabeth Chase question game. Especially that one bit. "Wait, all bending? You can do more than one?"

Given fire and water are already choices, she's kind of assuming other elementals, but the bigger question here is the 'more than one' implication. She's never really heard of a demigod being able to do that.