Hands… up or down?

My four-year-old brother wants to know if he’s supposed to shoot them when their hands are up or down.

We’ve had this problem before. He points the gun (perhaps a banana) at someone and orders, “Hands up!” Then, once their hands are up, he open fires.

That’s not good etiquette, so I’ve tried to explain that he’s supposed to shoot if they don’t put their hands up. He’s starting to understand how it works.

Now he orders, “Put your hands down!”