WH,

Add me to the list of wanting to throttle H's neck!

I am not sure about the advice to your S to call 911 as it places an undue adult burden on him. If this happens again, I'd advise S to call you and then you can call 911. I don't think D will be pulling this stunt again after this stern-talking to...I'd ask D why she felt the need to run away. I'd be interested in learning the real underlying reason for this behavior.