Miles falling into the role before he has decided to occupy it — the game's origin compressed into the logic of its epigram. The question of when is the wrong question: the becoming is not a decision made at a specific moment but a continuous process, the choice expressed through action rather than declared in advance. He won't know he just is is the game's most honest description of how identity works for Miles: not the announcement of the hero but the recognition, after the fact, that the person who showed up was already Spider-Man.