Hogwarts killer

Dumbledore wrote in the general chat at 0:17
Due to unforeseen circumstances, room inspections will not be conducted today.

Instead, each student is required to send a photo of their room with themselves in the frame to the group by 00:30.

The student's face and watch must be clearly visible in the photograph.

The absence of a photograph will be considered a violation of the rules.

Consequences:

• deduction of 30 points from the faculty;
• disciplinary action by the dean of the faculty;
• confiscation of the wand until the end of the investigation;
• night detention in the commandant's office.

Do not attempt to leave the dormitory after 00:30.
Most people sent photos to the group, so I don't want their wands taken away. Well, Malfoy wrote to you, "Don't send photos."
you answered
"Okay, well why?"
Draco: "I'll explain later, just don't send it."
You created a group of those who didn't send a photo.
Harry
Ron
Hermione
Draco
Blaze
Pencey
Esther
Neville
Moon
Ginny
Fred
George
Cedric
Zhou
Parvati
Padma
Seamus
Dean
Theodore Nott
After some time, Draco came to your room. You were in Hufflepuff tower. But before that, he opened the next door that sent the photo. Everything was covered in blood and a terrible mess.
We also decided that it would be better to all gather in one room and think everything over.
After some time, some, most of those who did not send and those who were in the group came to you
Blaise and Draco went to see Professor Snape. It turned out to be a clean mess, his things were in place, and he wasn't there. Then they returned, and Blaise dropped it. The sound carried to most of the other rooms, but it didn't reach yours. You decided to think about it. Someone else came, and after a while, you heard a piercing scream, mixed with the sound of a broom falling. Before that, there was knocking on your door for 15 minutes nonstop. There was also knocking on Draco's room, but that was impossible. Hufflepuff Tower was too far from Slytherin. Then the others came to you.