Paperchase you are tiresome sometimes... I've given Jeff two or three valid ways to kill the bastards without calling attention to himself. You can't set off explosives and not attract attention. If it was here, I might buy a 6 dollar explosive target and set it on top of the den and shoot it from a distance just to see what happens but that would be for my entertainment, really.

The best way is to scout out the den and gas them. Second best for Jeff is sniping them with an airgun.