User blog comment:Omega natsu2/Fairy Tail Episode 217: Celestial Spirit Beast, Review./@comment-3285005-20150124114936/@comment-7418318-20150124115702

If I had to make a guess I'd say it'll go something like this:

Natsu will follow his nose to the captured Spirits and free them one after the other by punching those spheres they were caught in with brute force.

That'll cause the Celestial Spirit Beast to shrink and grow weaker, until those outside can defeat it.

After his defeat, the CSK will return to his old self and restore the Spirit World, which also turns the Spirits back to their old self. And he'll pledge that he'll come personally if Lucy's need was ever great enough, as a little hint and you-know-what.