Jumping off your post:
Thank you, I was thinking that way also. Just a thought here don't even know its possible. What if the girls got to the lake, before 12:20, laid their bikes down, went into the woods, adult riding his bike does not see girls if they are in the woods and swerves his bike around the their bikes. Girls come out of the woods and decide to ride back down the street, seen between 12:30 and 1:00, that's a half hour time frame. Then for whatever reason they decide to go back in the park again, maybe Elizabeth remembered she forgot her purse, or maybe someone asked them to help them look for something? Just some random thoughts here don't even know if its possible, trying like heck to get the time line to come together.
12:15: Brovan (video)
12:23: Brovan
12:30-1:00: Elmer/Gilbert/Arbutus
They could not have been at the lake at 12:20.