User blog comment:FairyRaven/Fairy Tail Chapter 328: Zodiac, Review and Commentary/@comment-15267891-20130420234919/@comment-7418318-20130421174430

Remember when, right in the middle of the war with Grimoire Heart, he charged after Zoldies smell?

If Natsu is going to attack Zeref, it's probably because he's still pissed about his scarf being turned black.