Board Thread:General Discussion/@comment-24319911-20160701130131/@comment-27078917-20160827222320

Either Blast has a limit or needs time to recover after he fights seriously. That's why he only appears at God threats, where he uses all his power rarely.

Or Blast is like Saitama, craving for an enemy and seeks potential threats that can bring up a fight. And only appears when a God-level threat is about to appear, to actually have a worth opponent.