User blog comment:Pacifista15/Seriously, Luffy?/@comment-4493594-20111123100127

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I have a question... When a DF user gets greater control over his or her powers, does that make them less vulnerable to water or more? And does Haki have any effect on how much more or less it is?

Robin was able to summon two giant hands underwater. She was not quite as close to the water herself as Luffy is now. But still, if Luffy hadn't been so determined to save Fishman Island he would have collapsed even sooner because the water seems to have a greater effect on him as on e.g. Robin.