"Vampire's Touch is absolutely forbidden to use on other wizards." Allen stood on the platform and warned the young wizards in a grave tone. "If anyone dares to use this magic on a classmate without permission, then in mild cases, I'll put them in detention until the end of term, and they'll fail Ancient Magic Class. In serious cases, I'll apply to the headmaster to have them expelled from their House—if you cause serious harm to someone else, or even kill them, then the Aurors will take you back to the Ministry of Magic, where the Department of Magical Law Enforcement will deal with you."
Below the platform, Harry listened and glanced at the faces of the Slytherins, wondering whether Allen's words might have the opposite effect and make them do it on purpose at a time like this. Draco also opened his mouth, but remembering Allen's reminder just now, he swallowed the warning he had wanted to give.
"Once, Mr. Draco Malfoy used a summoning spell, Serpensortia, against Mr. Harry Potter in that Duelling Club during second year, and successfully summoned a black snake. I remember it frightened many of the wizards present at the time. Magic that summons creatures to assist in combat is actually very practical in battle..." Allen's gaze turned to Draco Malfoy, and he smiled at him. "It's just a pity that this sort of magic is only collected by those ancient magical families. At Hogwarts, we don't have a dedicated summoning course... Aside from finding ways to get hold of it themselves, students can probably only try to learn from the wizard Neville Baruffio, who said the 'f' in the Levitation Charm as an 's,' and attempt to obtain a buffalo standing on their chest."
This drew a ripple of low laughter from everyone,