If your approach goes slightly left of pin, the ball will hit some sort of branch, but as the screen shot from yanke J above, there doesn't seem to be a tree overhanging there, but when you are aiming from the usuall approach yardage, there is a tree to the left. I've hit it several times, so i'll always try and lay up to the right of pin.
This is the guilty tree, anyone got a chainsaw???