Just to reiterate what's being said in that * key * article:
BBM
Quotes:
'German had the presence of mind to hit record on her phone and because of that, police were not only able to release still frames of the suspect but an audio clip too.'
'The recording was longer than what has been released. Police won’t release anymore to protect the integrity of the investigation, but they’ve seen the video and likely won’t be able to stop thinking about it.'
End of quotes
I think it's "safe" to assume, the girls -or at least one of them- were (was) attacked right after that frame showing the POI/BG walking on the bridge, since Libby recorded it and LE was able to watch it on the video. It would not make much sense IMO and I doubt Libby would have had the opportunity to video record much later, unless she was able to conceal her phone and continue recording the audio only.
GRAPHIC/WARNING
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We recall the PC, where it was stated the pictures/ video frames showing the POI/BG were taken at a moment right before criminal activity was about to occur and Libby was a hero having the presence of mind to record it. Is it possible, that the killer eliminated or incapacitated one victim right away, possibly gravely injured her? If it was Abby first, did he make Libby carrying her over all the way through the creek over to the other side and Libby (did she possibly record it further via audio unbeknownst to the killer?) ? That way he would not have to touch one victim and poor Abby would have never dropped Libby to run away IMO. How terrifying.
All IMO
-Nin