I'm gonna echo a lot of sentiment here for a solid 5/10.
1) Nova never felt like a real credible threat, and considering her history, that's a colossal writing screw up.
2) Defeating her with the care bear stare is similarly dumb. Especially since she's a narcissistic sociopath. Now she has empathy? Cool. She still believes she's completely right and all other opinions are invalid because she's a narcissist.
Pacing was a problem as well.