[Waterbender, all right, it's reasonable enough to assume this Katara knows what she's doing as far as healing goes. But the rest of what Zuko says, not to mention that rising agitation... it's distinctly troubling, and Raine has to put in some effort to keep up her usual level of calm. She takes a deep breath, and starts to address things one step at a time.]

Nightmares of what, if you don't mind? [It has probably equal chances of being purely personal or important to the bigger picture.]

And can you recognize an outside influence, or does that anger feel like any other mood would?