User blog comment:ColdGrand/blackbeard's dark-dark fruit is a logia type??/@comment-1908942-20110309184035

I consider the Whitebeard incident to be like anger-activated Haki, like how his hands didn't melt quake punching Akainu. Still, something like being stabbed or something by someone confirmed not to be a master of haki (Like Ace using that Knife of his during their fight) would have cleared things up.