I have just started this game and I am in the city and I know I am supposed to poke the scaffold board with my sword (and I assume make it move slightly so you know you have poked it.)I can't do that. So I went on my way to talk to the man on top of the scaffolding, fine so far, but now I am to look down and pick up a stone on the left......no stone. HELP please and thank you.