Board Thread:General Discussion/@comment-24319911-20160701130131/@comment-5609685-20180108172816

I honestly think that Blast is an even more powerful, older and disillusioned version of Saitama. Just like him, his true goal as a "hero" is to fight worthy opponents. He probably undergo a training similar to Saitama's and since he's around from more time, he even reached a higher level than him. The reason why he doesn't intervene is that he wants to see what Saitama is capable of.

Of course, this theory takes in consideration the possibilty that Blast can somehow perceive someone's fighting ability from a long distance (just like DBZ characters can "feel" someone's powerful fighting aura even if they're relatively distant).