User blog comment:FairyRaven/Fairy Tail Chapter 397: Steel, Review and Commentary/@comment-25111584-20140826200458/@comment-25111584-20140826210549

Both of you correct, that's why I said that the only problem is that they shouldn't waste oxygen for speech. But, well, this is relative, depending on character's stamina rather than actual facts or character personality. That's why I don't have any real problem with it as compared to the other things that I didn't like in this chapter.

@Nick: Aside from the oxygen loss issue, you should be able to speak in water ...