I forgot about this, too, and I love it. I love that Sarah tries to find a non-violent solution, and that her lie is actually relatively plausible.
Note to self: Find an excuse for Nanase to wear that witch outfit again.
I think Sarah was still a bit intimidated by, and not sure what to make of, Nanase at this point. She was trying to sell her story, sure, but that "macho" part of it is telling.