A Malfoy Must Never Bow:
Draco remembers the first time he saw his father bow. It was of course to the Dark Lord, then his whims, then the perils of Azkaban, then the Dark Lord's whims again and then to his own cowardice by backing out of the war. Draco himself bowed to the Dark Lord and eventually to his own fears. Ever since his triumphant return from death all the Malfoys seemed to bow to him and his rules. All of them except his mother. She refused to bow in the end and betrayed her supposed lord and master to aid Potter in his quest. How ironic that the only Malfoy to never truly bow was actually a Black by blood.