Screw the sirens. What you want to do is put in a speaker with the sound of an approaching forky toes crunching through the leaves getting louder so that it sounds close then fading away again on a constant loop.
I'm afraid all that would do is further confuse Tom and we all know that he's confused enough. He still thinks he going to get old forky toes.
you guys have got it all wrong, this is kids stuff, easy.
He still thinks he going to get old forky toes. 
