DISCLAIMER - hiro is 17 while tadashi is 19 . so aunt cass has looked after their whole life give or take . when fred invites hrio to his house for a spring break party tadashi isn't happy but the legal age for alchol consumstion is 17 so technally it isn't illagal for any of them . after drinking for a while tadashi realizes that some dude was hitting on his younger brother who kept taking his mans hand off his wasit . storming over tadashis hand connects with his mans face making him stumble a bit grabbing hrio's hand he runs down the steps . but when this man had followed them outside a fight breaks out tadashi gets hurt making hiro come to his recsue by jumping on said boys back kicking off the wall stumbling backwards fallig down . the full blow gose on hiros back however hrio refused to let go . hiro would do anything for his big brother even if it ment putting him self through danger and pain .