Concerning bruises on the wrist and the difficulty of dragging a 200 lb. person, and controlling both of them at once: Suppose the girls were hand cuffed or 'wire tied' and a rope attached to the ties. BG could then pull the rope and the girls would be forced by pain to follow along. It would be pretty easy for BG to then have both of the girls follow him as he administered pain by pulling on the cuffs. Maybe the larger girl fell a few times and was even dragged somewhat by the cuffs until she got back up on her feet. Just tossing it out there.