To be fair, there wasn't really anything else it could have been. Maybe one of the gods of ishval could have turned out to be it, but that seemed too soon having just met the first of them.
I'm guessing either: Igneel has given him a message for Natsu (ala grandines left for wendy) Or he's going to teach natsu some new dragon slayer techniques. Maybe how to use dragonforce properly?
Still,I doubt either of those are going to happen right away, there is the more pressing issue of where that demon came from to deal with first.
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