For me, having worked in public school for 20 years, I could easily see a group of kids talking about an upcoming day off, maybe even looking forward at the weather forecast, knowing it would be nice, planning a meetup at the bridge, just to pal around. Then that conversation spreads, kids talking to parents, sharing on social media, being overheard by who knows who. I can personally attest to the tentacles of social media reaching far and wide. These girls didn't have to have a direct conversation with anyone. IMO, they likely didn't. But I do believe there could be an extensive population of people who may have known of their intentions to be at the bridge that day. A population unknown to LE. As far as the area around the bridge, and under the bridge, and down along the creek, I bet many a beer have been consumed, and many a joint smoked, all around there, by that population of local teens inclined to do so. I don't think BG escaped via that driveway, or by virtue of going back across the bridge from the direction he came. Too risky. MOO, he left via the way he came in, the cemetery. The only other potential escape that would provide cover would be using the woods to do so. Via the old railroad bed beyond the bridge, or up and along the woodline near the vacant home (the snowbird's place) and out to the driveway from there, or even to bridge creek, and out to Hoosier Highway to be picked up there.