And as Vernon raised his other fist for a punch, as Harry wanted to shove him back against the wall—and somehow, to his astonishment, did—as Petunia came in and screamed, as Dudley lunged for him only to be desperately restrained by his mother, as Harry delivered his ultimatum—"You will not touch me again"—and Vernon assented, as the Dursleys headed to the hospital to get Vernon's kitchen accident treated—Harry Potter formulated his first rule.