Hermione, the girl who publicly humiliated Draco and the whole Pureblood cause, now owes a blood debt to Lucius Malfoy.
The dictionary attack by H&C on Hermione happened before Hermione defeated Draco. (edit: sorry, not months before, but still before.) Back then there was no reason for Lucius to target her or even publicly notice her existence.
Edited to add: in fact, the attack was immediately after Hermione had been made to stop her anti-bullying campaign and publicly punished and humiliated—partially making up for any offense she caused Slytherin up to that point.
The dictionary attack by H&C on Hermione happened before Hermione defeated Draco. (edit: sorry, not months before, but still before.) Back then there was no reason for Lucius to target her or even publicly notice her existence.
Edited to add: in fact, the attack was immediately after Hermione had been made to stop her anti-bullying campaign and publicly punished and humiliated—partially making up for any offense she caused Slytherin up to that point.
The attack depicted in Ch. 77 was clearly recent, after the events of the SA sequence.
Oops, sorry, my bad. I was thinking of H&C’s first appearance. But it was still before Hermione defeated Draco publicly.