In the players' changing room at the Quidditch Pitch, a pair of redheaded brothers concealed themselves and crept up to the wooden partition separating the pitch from the changing room. From here, they could see the entire Quidditch Pitch.
After returning to the Castle, they had been full of curiosity about what Su Er and Snape had gone to the Quidditch Pitch to do. As it turned out, that was precisely when Snape had started taking things seriously.
Through the gaps between the planks, the brothers saw this scene-Su Er's hands and feet were bound with vines, and he was hanging upside down.
Snape's face was cold and utterly expressionless, but in the brothers' eyes, it was clearly twisted into an evil grin.
"Gulp..." One of them swallowed.
"I think we'd better go back to the Castle and find Professor McGonagall right now... Fred."
"We have to hurry, or we might lose a good friend tonight, George."
"And we have to tell our classmates what's happening here. If you anger Professor Snape, he might not kill you, but he really will torture students with magic." As he spoke, George shuddered at the sight of Su Er dangling helplessly in midair.
"We must absolutely, absolutely, absolutely never cause trouble in Professor Snape's Potions Class." Fred nodded earnestly.
"If we behave ourselves, we might keep our lives and survive until graduation." George nodded vigorously too.
"There's no time to lose. Let's go find Professor McGonagall now." As Fred spoke, he took another look through the gap.
"If we're quick enough, Su Er might still survive. Snape's casting spells with his wand now. My God!"
"But isn't Professor Sprout the closest? I'm afraid we might not have time to go to the Castle to find Professor McGonagall, but Professor Sprout is right there