Frankly, no re SA and yes wrt to RL if my theory is anywhere close to the truth.
Someone may or may not have been drinking and I think there may be a good possibility they were.
Anger>confrontation>accident>murder>coverup
If I remove accident from the equation, it gets darker for me but it doesn't make me change my opinion on how and why that much. I do not believe this was a first confrontation or that those girls didn't recognize BG.
Watch the presser I referred and linked to earlier with Riley, Delphi COP and Sheriff Tobe L. Someone asked about discovery of the girls and whether they were covered or out in the open, or words to that effect. Watch the faces of those three LEOs when you listen to the response. It made me think they were covered and something about how the bodies were found was disturbing. That was my take, but I may be way off.