I have recently started the Watcher in the Wings side mission. I have found all four locations for Azrael and found his final location, but I didn't scan the symbol behind him. Now, when I try to scan the symbol again, it says symbol already scanned and it is now impossible for me to complete the side mission. I've tried restarting the XBox, but it didn't help. I really don't want to restart the game, since I have all Riddler trophies and riddles solved. Can anyone help?