Even Luna doesn't avoid getting hit in the crossfire, that's just how accidental magic is. Debris hits her, but she manages to avoid getting hurt too badly. It gives her the chance to work at the magic that's frozen her in place, with Luz now downed.

Finally managing to free herself, she slowly approaches Luz. Luna twists her wand at her, casting a charm to press the girl hard into the ground — keeping her down, not letting her get back up. She's done with this.

"Stay down, or you die." it's uttered so softly for words that are so hard. But she means them. "Do you understand?"