Well, technically...Wonder if Luke and Leia ever talked about being chased by lady Inquisitor, when they were ten, and on the same week too. Wouldn't be surprised if there's already a Marvel comic being writen about the trio reuniting.
He is told they are being attacked by Tusken Raiders, leaves the room he was in right before Reva came in, and she had the lightsaber off while following him in the dark. I think they were trying to show that he never saw her fully, never saw the lightsaber on, and was knocked out and stayed unconscious. He probably always thought it was a Tusken Raider attack.