Picking up the shattered fragments

What did they do?

'Do you know the felling when you know something is awfully wrong but you don't quite don't understand why you had that feeling?'

That's exactly what happened to the blue haired boy one day he had a feeling he just couldn't shake it was dreadful...
So...
Dark...
And Depressing...

He was labeled the school's punk kid because he had blue hair, several piercings and a cold blunt personality and it didn't help his mother was an acholic and his father left when he was little... And the fact he had a tattoo on his neck.
He was heading up to the roof top

That's when he found her body the girl laid limp and dead. Well almost she was still breathing as he saw her body some other students ran past him leaving the scene. Ace rushed to the slowly dying girl, her face was violently bare and she looked at him with deep blue eyes like a fire once burned in them but now was extinguished it was sad. He looked down at her body slashes were everywhere and she was bleeding everywhere making a pool of crimson surrounding them she looked tired. Ace removed his shirt as he tore it apart to help stop her bleeding she weakly pushed his hand away "d-don-t" she looked at his eyes she looked at him with dullness in her eyes "pl-ease don't A-ce" she knew him but he never met this girl before "don't give up" he moved her hand away from his and he tied the fabric around the gushing wounds to add pressure to stop her bleeding he called 911 as she slipped in and out of consciousness.

Now he's by her side at the hospital no one came for her. he looked at her eyes under the breathing equipment, to think she may never open her eyes again gave him the chills. she was in a medically induced coma because her being awake would cause her so much pain. His jaw clenched as he remembered the students running from off the roof top.

'What did they do to her'