"Monsters are real, and ghosts are real too. They live inside us and sometimes they win." Stephen King
The Doctor wonders if Amy had felt her mind snap. If she felt the things she had learned over the course of her life -right, wrong, love, regret- just falling away. Or instead had it been quick, falling out of her head as easily as she had fallen out of that chair?
Rory had been the one to stop her from crossing the line between feisty and dangerous. Now that her fiance is worse than dead, Amy’s scruples having been pulled into the crack with him, she is beyond depressed. She’s homicidal, almost memories of things that could never have happened, haunting her until she finally snaps.
There’s a sword in her hand, and the villagers aren’t really afraid. What’s this silly reddish girl going to do to them.
It isn’t until the Doctor is pulling her back into the TARDIS, a sticky red coating her hands clothes, changing even her hair to a different red, the he realizes there’s a smile on her face. She pulls away, heading deep into the time machine leaving the Doctor uncertain, with a strangers blood on his hand.