The limited information that's been released could fit so many scenarios. We're not allowed to sleuth the girls families and I haven't so this is just a scenario off the top of my head. But "down the hill" could have been instructions directed to only ONE of the two, after meeting someone she recognized who planned a quick get away. She refused to cooperate and whatever happened next resulted in tragedy.
I think it's interesting to explore different possibilities. We seem to be pigeon-holed on mainly one.
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I don't see any pigeon-holing in noting that it seems that whether they knew the person or not, or whether it was a gun or a knife or a compelling verbal message or whatever, there was a mission to do harm and the person who did it had the ability to swiftly get and keep two victims under his control. And he succeeded in a double homicide shortly thereafter. This implies to me that details about potential scuffles, resistance, a target victim, and even bridge access directions recedes when placed next to the outcome. The details are definitely important in the bigger crime picture because three people who didn't belong together came together and two are now dead. But the question for me is, no matter where the suspect took notice of the girls and how he got access to the bridge, why were they murdered? And why there? That's where locations and access points start to have relevance.
I've considered several scenarios and I just don't see a familiar person as having done this. For one thing, if a person for whatever reason plans to accost a known child and quickly get away, I cannot imagine that he has it together enough to think on his feet under the stress of her resistance, get her
and her friend marched to a location that is not his desired destination, and complete not one, but two murders, then get away unnoticed. And why would he confront his target if a second person is there to witness that and then poses an added problem for him?
Keeping it simple, and given the remarks of police and FBI, the federal resources and attention to this case, and the battalion of billboards that went up - and given the LE has surely put any and all family/friends/associates/social media connections and then some under the microscope and so far turned up nothing - I think it's a predator who was doing what he does best that day.