User blog comment:IamJakuhoRaikoben/Chapter 366: 1000 Souls, Review./@comment-5598380-20140109213300/@comment-7418318-20140109213539

How is Natsu supposed to pay with souls?

According to Mangapanda it seems to be a measurement of the attack strength, while Mangastream makes it sound as if Franmalth will kill 2000 Humans in retaliation for the "Sin" of Natsu hitting him.

Personally I don't trust either translation at the moment.