User blog comment:Monkey d strawhat/True colors/@comment-3125914-20120210081510

I was thinking that after a long fight, Blackbeard tries to kill Shanks but suddenly Luffy appears. Basically Luffy to the rescue. But this sounds too good to actually happen, so I go for the 2nd theory: Luffy continues his journey without knowing that Blackbeard fought Shanks and killed him. Until he meets him (BB).