did they know he was vader? I cant remember if they were aware of him being refered to as vader. it may have come up during the fight, also during the holo cam recording...but this would only inform Obi-Wan and Yoda of it, not Bail.

Also, I found the book explained this (and other things) a whole lot better. I dont want to put out book spoilers, but if you read the book you'll know what im talking about. or if you want to know how without reading the book send me a pm and ill explain. (i guess i could just post it with spoiler warnings too, maybe ill do that later when i get home)

-Darth Simon