"You've got to really mean it, if you use a grater on somebody," she nods. "I mean, a gun, you can pull the trigger by accident. Arrows, same thing, more or less. Knives are more personal but you could stab somebody once out of reflex or something, kill them without trying to. With a grater, you've got to put a lot of force into it and just keep sawing away."

She sips her tea.

"It wouldn't have been my first choice of weapons."