I understand what you are saying. The girls rode to the lake, were snatched off of their bikes, and the bikes were moved in some way from how the girls originally left them. Do you think the purse was also moved?
Now that I've changed my mind and decided that I believe the girls rode to the lake, I now must decide whether they rode there for the heck of it and had the misfortune of running into the perp(s) there...or whether they were lured there for the purpose of being taken in a more secluded setting than say Brovan. I think most likely they were lured there to be taken. Someone sent them to their deaths.