I think "down the hilL" is a little ways down the ridge, towards the house, "down" to the road.
MOO is this guy cased the park several times beforehand. My theory is he checked both Mr. Logan's and that property to see if anyone was home that day, and may have checked both homes on previius visits.
From the 2nd floor of the house on that map would have at least some view of where the two creeks meet, where the ridge tapers and ends by the road, and the area where the girls were forced to cross the creek. Visible from the house, not visible from the main road adjacent to the property.
From Break.com, two or three days after the murders:
Two possibilities, here, if they indeed did cross the creek.
The perp had control over the girls, but they were hidden from any view from the bridge, which again may seem damned near impossible, but most of us on here have never been to this place and don't have any context/frame of reference. This is another reason why I think BG knew that park like the back of his hand. He had to get the girls off and away from the bridge.
Cheyenne may have been on the bridge when the girls were still alive, and I think the 2nd possibility within this short timeframe is they were already on the opposite bank, but hidden from views from the bridge.
It had to have been over in a matter of minutes.