During their revue of hunting, Nana is trying to get Junna to stop. "All you do is parrot borrowed lines/your star is just a piece of space trash" "you can't take a hold of your star anymore" "it doesn't resonate, I can't feel it, it doesn't reach" "you were dazzling" Nana is beating Junna down to try to get her to stop. But Junna stands tall and refuses to back down. She refuses to play the role Nana has given her. When Junna says "You'll have to try to kill me, Daiba Nana" she's saying that she'll die before she'll give up.
Nana doesn't see Junna for who she is. Nana sees her own idolized version of Junna. A Junna that's strong and caring, but too weak for the lead. When Junna says "You're the one blinded by the light" that's exactly what she means. Junna is breaking free from Nanas grip on her.
