When he opened his eyes, the room was dark. He blinked as his eyes started to adjust and he could now see different forms inside the room. Carefully he stood up. His knees felt so weak, that he had to grab hold of the chair besides him, to keep him from falling. A strange scent filled the air and made his stomach turn as he recognized it. Blood. It seemed to be everywhere: on the floor, the walls and… his hands. His shirt was drenched with it, and stuck to his chest. He felt a burning pain in his right hand. But the only thing that came to mind, was to find a way to get out of this place.
He made his way to the other side of the room, and finally after what seemed hours, found a doorknob. As he turned it, he pushed against the door with all his weight, which almost caused him to fall into the other room. A faint light was coming from between two curtains. He walked towards the light, pulled open the curtains, and almost closed them again when a bright light blinded him.

Suddenly he felt a presence in the room, the feeling had been creeping up on him for a while now, making his blood freeze in his veins. He turned around, not knowing what the presence would be, but what he saw then, blew his mind and was a lot scarier than he had dared to imagine.

On the floor, to his right, lay a man. The man seemed to be bathing in his own blood, his body so terribly mingled that he barely looked like a human. Besides him lay a knife, the purpose it had had was quiet obvious. He walked towards the body, knelt down beside it, and turned the body on his back. Two dead and broken eyes stared straight into his. The face of the man had been left unharmed. He knew that he had met the man before, but could not remember his name.
Trembling he stood up, wondering what was happening to him, where he was and for that matter, who he was. He walked around the body, trying not to slip in the pool of blood on the ground, towards the door. As he pushed him open, he felt a cool breeze, followed by warm sunlight. He stepped out into the open and found himself standing on the porch of an old house, which seemed to be in the middle of nowhere.
Suddenly a familiar tune broke the silence and he felt an annoying buzz against his leg. He reached into his pocket and pulled out his mobile phone. As he put the thing next to his ear, he heard a soft and kind voice.

“Kristoph, where are you? I’ve tried to reach you over and over, are you okay…?”
“We’ve been worried sick…”

Kristoph seemed to be watching this all from a distance, as if it wasn’t really him standing there. Everything started to turn black, as he dropped the mobile phone and felt his head hit the porch. Somewhere, far away he heard sirens ring, but slowly that sound too, faded away.

To avoid any other confusion: Kristoph is about 16 or 17 now. It will become clear in following chapters!

When does this take place? Shouldn't Kristoph be in jail?

It takes place well before AJ, Kristoph is about 16 or 17. Somewhere in Germany.