Malfoy and his bodyguards made a mistake in attacking Nott's...
So the Death Eaters that want out, helped the Grangers... nice.
Author's response
Malfoy is just desperate to protect his influence in the Slytherin Common Room. The Death Eaters have excellent reason for leaving the Dark Lord - what better way to get in Potter's good books than by helping one of his friends? Thanks for your encouragement and thanks for reading and reviewing.
Regards,
Maidros