Dear Dr. Grant,
It has come to my attention and there really is no good way to say this but
your life is in danger and you've pissed off the Dark Lord the Dark Lord is quite cross with you, regarding what happened to Fenrir Greyback. As it stands, I am in a position where I must favor him
because he is quite persuasive and I'm afraid I will only be able to procure you the Wolfsbane potion for next month, provided I receive proper compensation
unless you figure out what you did and apologize, which really is the best idea if you like to live!A very concerned,
Horace Slughorn