Major Treble-What Exactly Happened?

9:13
Suspect Thalia was seen coming in with suspect Hillary and/or Walker
Electra was seen in her seat.
Walker came in with a backpack, oboe, water bottle from Wicked*
Hillary started setting up instrument.
Thalia Started setting up instrument.
Walker went to get water for his reed.
9:14
It was confirmed by then there was a substitute teacher.
Thalia and Walker *and Hillary* were all seen getting music.
Thalia and Walker were seen talking, *some say they heard the word "secret" being spoken by Walker.*
Thalia seen giving Samantha dirty looks.*
Most were in their seats, including victim Samantha and victim Meghan.
9:15
Subs explained the practice room assignments:
Hallway: Flutes
PR1: 1st chair clarinets
PR2: 2nd chair clarinets
PR3: Bassoons
storage room: saxes
Band room: Percussion/Low brass
Walker raised his hand, having been forgotten. Sub says to go with 1st clarinets Meghan and Samantha.
Last confirmed sighting of victims walking in PR1
9:45
*some claim they saw Walker arguing with first clarinets.*
10:01
People are told to come out of practice rooms.
Jared claims to have gotten Walker out of PR1. According to Jared he seemed "off. He was on the ground, appeared to be disorientated and came up suddenly, as if he had been sleeping."
10:03Everybody was in their seats except victims. Asking Walker where they are, he answers that he thought they were out already. People ask him to stop joking but his face remains serious. It becomes apparent that they are gone. The Band room goes under lock down.
10:05
After calming down, a few accuse Walker, and lock him in PR2, where he is now.

then things got really interesting....