Hey everyone, new user here. Long time lurker but this case has prompted me to create an account, finally got around to doing it so I could add some input, however minor it might be.
1. Based off of everything I've read I do think that he forced them down the hill (with some kind of firearm, I find it unlikely he'd have the same sway if it was just a knife) where he proceeded to make them cross the creek
2. I can't be sure of the latter but the police would be, I don't think they ran across the creek to get away from him like the others have said
3. My reasoning for this is that the area where their bodies were found would be the perfect place off the trail for him to execute his will on them, far enough away and out of sight where people would be less likely to intervene if they did hear something and the chances of someone spotting it happening would be quite slim given the time frame.
4. I do think he was waiting near the start of the bridge a ways back maybe a bit off the trail until they passed where he proceeded to follow them
5. By the time the girls noticed they were already too far up the tracks to turn back, something about his demeanor creeped them out enough for one of the girls to start recording, this doesn't seem like normal behaviour in my opinion.
So in conclusion, I do NOT think this was a random killing but it's possible the girls were random targets, I DO think he pre-planned everything, from the placement of the bodies, to the lack of evidence, to the response by the FBI, to the calculated and determined sound of his voice. Taking that into account I also believe that he knew the area well and frequented it, he has probably killed before and might strike again based on what I've read about other cases and from how calculated this attack sounds.