[It was actually Katara's assumption that the place was forbidden, since Toph had said it was the lab, but she's not inclined to go out of her way to point that out. Now that her concerns have been eased, she's had a chance to notice that this guy is actually really cute. Not that that makes a difference. Nope, not at all. She's learned her lesson. She'll treat him the same way. In fact, to prove that to herself, she's going to tell him.]

That does make sense. She said that you guys were filtering it, but she didn't say why. That was why I thought it was forbidden. [Her brow furrows] Why are you expecting trouble from the east? The barrier doesn't keep people out, just in?