Solution
Beneath The Bush
Had the victim, already bloody enough to leave a trail, rolled down the embankment, there would have been some blood on the actual embankment along the path his body took.
But since there were only blood stains in two places, the road up top and the boulder down below beneath the bush, we know for certain the victim’s bloody body did not roll down the embankment as George theorized.
Mogau figures that the body had been placed by the boulder and made to look like a hit and run…