I really think he got on that bridge before the girls were even fully across. When L got to the end, she turned around and started the video. He was stalking them and they sensed it. Maybe they'd had an encounter with him already on the trail. But they realized in less than three-quarters of a minute that he was bearing down, had a gun, and they had nowhere to go. It pi**es me off. And no, there is no reason for the public to hear that, at all. Jmo.
I've seen a lot of mention of there being multiple videos. LE has said that from the very beginning. I suppose it's possible L started another one while BG was with them, but my feeling is that these other videos are the ones LE have referred to as the girls talking about girls stuff on the trails, just being teenagers.
The billboard "last seen" at 2:30 does leave me unsettled, though. If the CS is that spot below the cemetery, that's only like 700-800 feet from the end of the bridge. Given extra time for rough terrain and crossing the creek, would it have taken more than 5-8 minutes to get there if they didn't stop? I didn't time it when JM did her video walking down the hill and to the edge of the creek, but it didn't look that difficult. Could BG have led them there, killed them quickly and fled the area, only to be captured on another camera or seen by a witness at 2:30? Is it totally unrealistic to think he could manage all that in 17 minutes?