solution to the mystery: if you look closely the shadow on the left is from the tree with the low branch. due to the uneven terrain her shadow veers to the right creating what looks like a bulge in her stomach. this leaves an illuminated area between the shadow of the tree with a branch and her shadow!! mystery solved. if you like this kind of thing why not check out the guess the shadow contest here: @eolianpariah/entry-smash-205-shadow-boxing