Katara gave Masaomi a quick glance and then she nods with a small smile. She's never actually... asked anyone what it felt like, so that's interesting.

But now that Buffy had brought it up, Katara felt it was important to clarify: "I'm not borrowing or taking anything. I'm just... encouraging the natural balance to speed up, making things right. The body wants to function properly, I just help make that happen faster."

...so yeah. Basically she manipulates someone's life force for their betterment with casual ease. Not scary at all, right?