He is teaching one of the classes and one of the students in the front row is banging lightly their wand at the desk which makes a quite annoying sound

Stop it, how would you like it if I banged you like that against the desk?

He is tired and frustrated (he usually is sweet and gentle but his full moon is soon) so he didn’t realise what exactly he said or what could it mean for teenagers until he heard some boys yelling from the back: “Yeah, would you like to get banged by the Professor”