Говорится, что Снейп в компании с Эйвери и Мальсибером издевался над Мэри Макдональд

‘We are, Sev, but I don’t like some of the people you’re hanging around with! I’m sorry, but I detest Avery and Mulciber! Mulciber! What do you see in him, Sev? He’s creepy! D’you know what he tried to do to Mary Macdonald the other day?’

Lily had reached a pillar and leaned against it, looking up into the thin, sallow face.

‘That was nothing,’ said Snape. ‘It was a laugh, that’s all –’

И позволял злу (маленькому говноеду Драко) оставаться безнаказанным.