What if when Fenrir scratched Bill in the fight, he did actually bite Bill and that it did some good for him? As it leads him to find his true mate in Hermione. What if there’s more to Bill and Hermione than any of the others ever knew? The wolf just confirmed things for them.

My mate is just that… MINE! All of them can go and do one. She is now the mate of an Alpha wolf, who won’t let anyone get between them, even though they couldn't if they tried.