Man, 6 years old was not like that for me, and it was only like 18 years ago. I don't think I would have been capable of threatening myself or someone else with the glass of a picture frame.
Activity like that needs the stun gun. It's like the baby rattlers or whatever, they always say they are more deadly than full grown rattlersnakes. They are younger so they don't know the damage some of their actions can cause. That kid needs some intensive therapy and strong discline.