User blog comment:FairyRaven/Fairy Tail Chapter 425: Sabertooth X792, Review and Commentary/@comment-76.121.234.236-20150323112525/@comment-79.249.55.8-20150323114145

Natsu has a hunch I think...? he knows that Frosch is gonna be killed by Gray anyway. It's one year later. Frosch is leaving the town. Frosch could be killed during this certain mission... so why not?