The memorial had this situation--I think hole 10(? IRC) is a good example. I do think it could be an issue and the actual vertical line of the mando boundary should be clearly indicated.
Hammes hit the limb on the correct side of the mando and the disc went past the tree trunk about 10', so he "made" the mando, but did go inside one of the limbs of the tree.
I would guess they defined the edge of the mando as the outermost edge of the tree, so going between the limbs was fine..
Bill, any course insight?