User blog comment:Dany1459/Doflamingo's Abilities/@comment-4117216-20110921145350

I have never thought of it like this. It is a possibility. However when you brought up that Doflamingo had no effect on Crocodile it made me believe that it is indeed a DF ability and not Haki. I personally think Doflamingo is very confident in his ability and it would not look good for him if he had no effect on Croco-Boy. In other words, why would Doflamingo do 0 damage to Crocodile? If he was trying to pursuade him, I would believe he would use the haki to control him and force him to do what he wants. I hope you are somewhat following me, because I am confusing myself here to be honest.. Conclusion. I think it is a Devil Fruit. If there was some martial arts like this, there would be more people doing it because it is so kickass. (Unless Doflamingo killed everyone else...)