User blog comment:IamJakuhoRaikoben/Chapter 410: Memento Mori, Review./@comment-4449950-20141123060745/@comment-7418318-20141124100804

Sure it was before his transformation, but doesn't that make the point even MORE vaild? If Gray's Ice Devil Slayer Magic could only wound Mard in his Human form, why would Gray think that he can just easily one-shot Mard in his Demon form once his powers land a clean hit? Does he think his Demon form makes him more vulnerable to ISDM instead of more resilient to it?

The part about not wanting to offend would be a lot more believable if it wasn't followed by an ass-emoticon...

Regarding Natsu's supposed insta-mastery I have to disagree. When he gained his LFD mode all he really did was adding lighting to his already learned techniques and give them a new name, even though they weren't really anything new at all. He didn't really do anything new right off the bat (or ever since -_-). The only time when he used lighting in any other way than adding it to fire attacks was that one lightning that struck right after Hades deflected a fire attack. At least I wouldn't call a simple lighting strike anything that needed training to achieve.

For every other technique he ever used, he had plenty of time to secretly (or not secretly) train between arcs "off-screen".