I saw one over hell mouth shot it with my Gjallahorn. The initial shell hit it and it flew down the hellmouth hole, the Wolfpack rounds spun and went upward, they didn't want any part of the dragon, Fortunately I did! so I jumped in the hole to get that bastard. After a shot fall I was killed and spawned up top again. ;) guess you had to be there.[spoiler]wink wink[/spoiler]