"Linda has some very powerful electric attacks," Katara's voice was somewhat detached, it would be hard to tell if she was being complimentary or clinical. "And Masaomi just took the full brunt of at least a... partially charged one."

And a part of her was subconsciously impressed with the way he put himself in harms way to take care of what was his responsibility.

"So I'm healing the damage it did to his chi system and restoring the natural balance in his body."

The healing with her waterbending was uniquely suited to fire and electrical damage. Buffy may have noticed how the water on her hand and on Masaomi's forehead is glowing.