Just as the professor had said, the troll was indeed in the boys' bathroom on the third floor, and Neville, whom Hermione had seen before, was there too.
He had been bullied by Draco again during the day, and because of his poor performance in Potions Class, Professor Snape had kept him behind for detention to clean the Potions classroom.
After returning to the common room, he had thought his friends would comfort him a little. Instead, Ron absentmindedly played with Mouse and complained:
"You gave Snape another chance to dock our points. If we don't win the House Cup this year, it'll definitely be all your fault."
Ron had completely ignored the fact that he himself was responsible for the most points Gryffindor had lost. The few points Neville lost in Potions Class were not even a fraction of what Ron had lost in physical education.
But Neville did not remember how many points he had lost. Hearing that, Little Fatty felt utterly sinful and hid alone in the bathroom to cry.
As a child, he had witnessed his parents being tortured into madness by Death Eaters. After they were rescued, his grandmother had cast a spell on him to protect him, hoping to hide those memories.
She had not wanted to erase them completely, so she had not used Obliviate. Instead, she had used a Confusion Spell, hoping that he would still remember who his enemies were when he grew up.
However, the old woman might have suffered mental trauma herself because of what had happened to her son and daughter-in-law. She had used too much force while casting the spell, leaving Neville with serious memory problems and a habit of forgetfulness.
That was why he had completely forgotten about the Halloween feast that night.
By the time