User blog comment:IamJakuhoRaikoben/Chapter 411: Quid Pro Quo, Review./@comment-5303512-20141202160746/@comment-4829046-20141202161555

Check out the box in the cover page. The translator put a note there. Here is the explanation from stream

Just posting for vox 'cause he couldn't be here right now:

Hi there, voxanimus again.

A few notes about translations of Natsu's and Gray's attacks in this chapter.

''What I have translated as "Igneel's secret teachings!" is, in Japanese, イグニール直伝 (イグニールじきでん, Igneel jikiden). This translates literally as "Igneel's direct transmission of secret techniques," but that sounds stupid so I changed it. At any rate, what Mashima (or I guess Natsu) wants to convey here is that this technique is something that, presumably, Igneel passed directly down to Natsu.  Shiranui Form, in Japanese, is 不知火型 (しらぬいがた, Shiranui-gata). In other translations, this has been rendered as "Hidden Fire Form." This isn't exactly correct. The literal translation of shiranui would be "unknown fire," and it's actually a term used to describe will-o'-the-wisp and St. Elmo's Fire, types of mysterious lights seen by sailors at sea. They look like fire but are often strange colors like blue or green and aren't started by conventional means. (Actually caused by reactions of elements in the atmosphere, check the Wikipedia pages.) Hence, unknown fire.

However, the term Shiranui-gata actually is used in modern Japanese. It refers to a style of entering the ring practiced by sumo wrestlers. The other is 雲龍型(うんりゅうがた, Unryu-gata). Because this term refers to a real-life concept, I have only transliterated it. However, it isn't particularly incorrect to think of it as something along the lines of the "Secret Fire" or "the Flame of Anor" (10 points if you get the reference).

Lastly, we have Gray's archery-type attack. This, and his long-sword thing, have both been translated by me in the past as "something something of the Ice Demon Zero." The words "Ice Demon Zero" are written in Japanese thus: 氷魔零 (ひょうまれい, Hyouma Rei). They can be read as a name, and, indeed, if you google "Hyouma Rei" there are several anime characters named things very similar. I can't tell exactly which one Mashima is referencing, but, to be sure, there definitely is some reference there. I just wanted to make sure that you all were made aware of that. It's probably not something particularly important to the story, but, you never know. I could be totally wrong. Anyone with any ideas about particular Hyouma Reis this name could be referring to, please feel free to voice your opinions in the comments.

And with that, I take your leave. See you next week, homeslices.

- voxanimus''