User blog comment:TheCarrotSaysYumYum/Dragons, People and Demons.../@comment-4829046-20120721143100

I said this in Rai's blog but it fits more to this one so here it is

"Yes, people already noticed that. But then again....technically it isn't Natsu's scarf, its Igneel's. Maybe the scarf is resistant to Dragon Attacks or maybe it symbolizes something.

Here is another theory. Remember how the scarf is unaffected by Zeref's magic? Maybe it means that Acnologia uses Death magic as well or that Scarf represents Demons."