Only that he was *not* on any kind of drugs and that he had been hiking much of the day. He came to a very deep part of the wood where he'd been following a game trail and he felt a presence. He turned his head and saw a face in the leaves. A blink later, it was gone. He said it left him with the most awesome feeling though.
He didn't tell you any more about the green man. His powers? What a person has to do for a visit? Was there a sound, to cause him to turn his head. Was it kind of like seeing a ghost?
He didn't talk about powers when he related the story, but then as a Pagan, I already know the stories of the Green Man and what he symbolizes. He only said that he had a feeling of being watched, but it wasn't malevolent, just curious. It was gone before he knew it. I think it was mere accident that it happened. He didn't do anything special to find him. He just appeared, like seeing a face formed out of the leaves.