She blinks a bit, obviously surprised. And then immediately after realizes the problem. "That's right, you're not from here." Amazing how easily she's just accepted that, whether it's completely true or not.

Opal mulls on how best to explain. "Well, you see... benders are people who can manipulate various elements through their own energy. An earthbender can do this with earth, a waterbender can use water, a firebender can use fire and an airbender does it with air. Metalbenders are earthbenders who use their ability to manipulate the bits of earth still in metal to bend metal as well."

She pauses there, then asks, "So... does any of that make sense?"