Anti-Heroes and Harm

Has anyone played or run Anti-Heroes, the superhero FitD hack? I’m due to run a game soon but the rule book is SO rules lite that I’m having a hell of a time trying to figure out specifics at all. The thing that I’m mostly having trouble with is Harm and how it is handled. The only real mention of it that I can find is under consequences from action rolls and that Harm MUST be resisted. Having to resist will always risk increasing your stress, which might ultimately knock the hero out of the fight, but I can’t find anything to indicate what effect harm actually has on a character leading up to them being broken.