George at a loss, looks around the crowd to see if there is anyone to ask what happened. Lacking that perception, he sits down at a shady spot if possible. For dective purposes, he than assumes some physicaly pushed the block. He now looks for the retreating path the 'pusher' would have taken. (spot/listen + 17). Edit: George uses his "hand of glory" to activate see invisibility.
When Morley walks near, George calls him over, "Morley, can you track in the dark? I ask because maybe tonight we can climb up there and see what we can find. I recommend you go invisible though."