I'm surprised Granny didn't get arrested. Locks the poor little tyke in her house and won't allow him to leave (kidnapping), even though she hadn't been physically threatened, pulls a weapon on him (aggravated assault), said weapon being an unlawfully possessed switchblade (evil assault knife).
Hopefully the little turd learned a lesson.
Got to admire the old lady's sand, but I worry about these kinds of stories encouraging elderly folks to get physical with low lifes and end up getting badly hurt themselves. Those faced with a serious threat should be encouraged to employ more effective equalizers.