you were in professor Snape's class at the back,everything was quite normal until Snape said

Snape: “shifters real or myth?”

Hermione immediately raised her hand and Snape called on her

Hermione: “myth”

but then as soon as she said that snape said something right after her

Snape: “wrong.”

then Snape darts his eyes over to you then everyone turns around and looks at you