These grazes on his stomach bring to mind an image of him, rolling Alliosn over the edge of the bridge, then him climbing the railing, and lowering himself over the edge, close to where the bridge starts.
When I thought about him sliding down the embankment, you would expect the grazes to be on his elbows (and I still believe I can see marks on both his left and his right elbows in the photos of him when he is first allowed back to the house, blue striped shirt)
But if he lowered himself over the edge he could easily graze his stomach when he slid down that concrete wall. Ill find a photo, bear with me
To back up the agrument that he left her at Wirra Burra Road, he could just as easily have grazed both the backs of his elbows and his stomach wriggling through that box culvert. (there is a thought Mani!!)
I know what Im suggesting isnt the nicest of thoughts, but its a big possibility in my eyes.
