If you do not have enough potion materials and props but try to capture the potion professor Snape, the consequence of angering him is that your HP will be cleared and you will not be able to log in to the game for 24 hours.
PS: The other person who can have the same consequences is Professor McGonagall's elf whom he met during the night tour.
Thanks to Daimao for the cover! So cute!
Conception: