Henry's faith in Sabriel is like that he has in his doctor—which is saying something, considering how young she is, not to mention female. But she's helped him significantly and literally saved his life and that genuinely counts for a lot—and he's also aware that she, like Dorian, has seen him in a truly vulnerable state, and he has a healthy respect for what that means. I think he might have condescended to her at some point had he not known what she was capable of, but she's proved her worth to him. Not that he isn't bemused by her—he still thinks she's dreadfully young and it seems very strange to her that a woman does what she does—but he'll take it, since he is alive, after all.

Una likes Sabriel—finds her interesting and smart, and admires her willingness to teach others. She's curious about Sabriel too—where she comes from, what her life was like before. Definitely wants to get to know her better—and sees her as a very valuable member of Team Malicant. She's counting on Sabriel to be a good ally in the coming fight.