Katara's eyes widened at Tia's statement until they'd almost grown to comical proportions. "We're falling off the end of the earth?" she echoed, her stomach clenching at the mere thought. Heights didn't bother her, not one bit. Falling, though? That scared her to death, especially when falling led to crashing and crashing was never good in her experience.
Still, there wasn't anything she could do about it now. They were already on their way and, even if she could convince them to stop, she wouldn't. Angel and Cordelia had to be saved. They had to, no matter what the cost.