Luna Lovegood was running, only sort of skipping, and not really casting spells, but waving her wand, and transfigured things, so they could battle.
The Acromantulas were scuttling over the disfigured castle, and Luna sighed. She now knew what it was to see war. She viewed it as morally ugly, but nothing is moral about murder.
Because when she transfigured someone into a tree, and when she cast a stinging hex at the face of an oncoming Death Eater, she could not help but appreciate the physical beauty. The green sickly light glistening off of the dark, blood stained walls. The tears ran down her face, and she ran through the halls, no longer skipping.
She dropped on the floor as rock rained down around her, and she looked at the light of the malevolent curses, and the benevolent forces clashing. A green light encompassed Remus Lupin, and in a brief moment of indisputable clarity, she yelled out for her Defense Against the Dark Arts professor.
She couldn't deny how beautiful he was in that moment. How he seemed to be lifted up slightly, how he curved, and how she saw him lower himself to the ground, but turned away from the sight.
How his face registered the moment of horror and opened his mouth in a horribly comical "o" and how the stars seemed to draw him in. Luna, in all of her life being honest and willing to believe in the best things possible, could not have been more confused. She knew that she would see them all again someday, the people death had claimed.
But she never got over how clear and unclear that night was. How the stars themselves glowed green, how they drew him in.
She couldn't even remember the moment the spell hit him. She just saw him glow green, and curve slightly. He was drawn into the night sky, and yet there his body was.
She doesn't remember him falling.
Yet there his body was.
And she still believed in all the things she believed in after that, and she never once lost her belief in some things, but she cast spells with more passion, with more vigor than ever before.
And when she was hit with an Imperio curse, and she faced Neville against her will, and the soothing voice told her to use the torture spell, she threw it off without batting an eyelash. And she used "Tarantallegra" and she fought alongside Neville for the rest of the battle.