My post got deleted earlier because I didn't post the link with it. I have now supplied the link.
On a "Gary Hughes Investigates" video on YouTube that starts at 47:58, Gary gives details of what is supposedly the contents of some of LG's video. He claims to have got this information from someone who knows Abby's mother, Anna.
Here is the gist of what he claims...
The gray material that you see a flash of in the BG video is Abby's sweater.
Abby is looking down and then looks up at Libby and asks her, "He's right behind me, isn't he?"
Then Abby hurries to the other end. The girls are discussing which way to go.
They obviously don't know him. Something about two ways. It's very hard to hear.
Then Abby asks, "Is that a gun? He's got a gun!"
He says, "Hey?"
Libby says, "Hmmm?"
He says, "Down the Hill."
The sound of a gun clicks.
The police pointed out to her the sound that they say is a gun clicking.
The perp was seen but no one can draw a picture that's better than what is available.
There are witnesses placing him there. He didn't bother them and they were alone.
Police think this man specifically targeted the girls.
No gunshots were anywhere on the girls.
My note: In regards to the audio released by police the guy clearly says "Guys" at some point but this word is not mentioned.