You can't share a lot with people outside your team and your partner team, and you can't sleep over at other team's dorms, either. Not unless it's your partner team's dorms. And no sacrificing yourself in games, or punching walls I need to tell Light not to, anymore, and you can't go to the pillar unless someone from Ophiuchus goes with you.
And . . . whether or not you know, Ophiuchus will enforce them.