User blog comment:Miskos3/Fairy Tail Chapter 486: The Fourth Guest, Review/@comment-7418318-20160525151848/@comment-7418318-20160527102424

How is iron supposed to let air through and filter out other particles?

The lung "puts" oxygen into the blood through a chemical process. Now it's already quite a stretch for my dispension of disbelieve that turning the lung into iron won't completely block this process from happening... but that these iron lungs would not only still work, but also change the process in this one specific and beyond convenient way to immunize Gajeel against this particular attack? That's taking it too far.

Mashima should have just let Gajeel hold his breath (thanks to the Torafusa fight we know he can hold his breath for a long time) and then have Levy (who entered the scene less than a minute later anyway) also cast a mask on him like she did for herself.

Logic would have been served, the shippers would have been even happier (nope I don't think it'd have been a romantic act either, but you saw how they reacted to her comment)... everybody wins... but no, instead we got this. :/