This Wednesday evening at 7:30 pm, Jacob is going to set fire to Lyle's side of the room and let it burn. He'll watch for a minute before walking to the student lounge and destroying one of the sofas with his lightsaber. He's so angry, confused, and thinks he's alone. :)
So, I don't know how long it would be until security finds out about the fire. A few minutes? There won't be any proof of Jacob starting the fire until someone tells him about it and he doesn't act surprised. After Charlie leaves, Jacob is going to Dizzy's room.