That new part of the story is suspect. Everyone crossed that trestle. They were probably just going to do what most did. They got themselves stuck between him and a difficult hill.
The one girl started recording soon after seeing him on the bridge coming toward them. Does not sound like a meet up.
However, new info may have come put since I had watched the show.
Those girls were 14. Both had internet access and probably interacted on sites to chat and talk to boys. I do believe it was a meet up planned with two hunky boys. Actually it was a pedophile posing as teen boys and they were lured there. This creep knew when and where to find them.
If you followed this story there appears to be a kind of local ring of perverts around there and a couple have been questioned and were suspects.
It appears the guy arrested was because of a tip and reward. He is a local and worked at the CVS.
The questions we don’t now is was he tied to the other local pervs?
As for the video on the phone, there is more that we are not allowed to see, but it could just be no reason other than video recording scenes that day and this happened.