Rose had watched as the Doctor's face darkened with rage. "I should have told them to run!" he shouted, so unlike the man she'd grown to love, "Run as fast as they can! Run and hide, because the monsters are coming!"
And now, staring in horror at the blood on her hands, because she'd just killed someone, some alien she'd never met before, an innocent person...
You should kill us all on sight!
The words ripped through her mind like shattered glass, tearing into everything that was her and twisting it into something else. Something she didn't want to be.
She knew, deep within her heart, even as she fell to her knees in the pool of blood that had formed around the body...even as the Doctor's panicked voice ran up behind her, his hands on her shoulders, his brown eyes held in front of hers, desperate and afraid and horrified at what she'd done, but not blaming her, no, never blaming her, because it wasn't her fault, it wasn't any of their faults, because they couldn't stop themselves, they couldn't stop themselves! Even as she fell forward into his chest, her hands painting his brown suit red, sobbing for the wrongness within her, the wrongness that had been forced upon her, even as his arms wrapped around her, she knew. She knew.
She knew he'd been right.