Hell Double

Thomas' head hurt. His head was foggy as he felt the blood pulse through it. "What happened?" He thought.
Oh yea.
He murdured them. His wife. His son. Even grand-dad. Then he committed suicide.
Thomas used to be a great man but there had been a buzzing in his skull, and he had started blacking out. Every time he did he'd wake up bloody, covered and cuts and scratches. On the last occasion he had woken to his family dead on the living-room floor and a bloody knife in his hand. Without a moment's thought, he slid the knife across his throat.
Now he was in a round room of dark stone.
"Get up," said a disembodied voice; whispy, but stern.
He lifted his head and saw a thing he couldn't describe. It shifted, and not in the way of morphing. The thing phased through many incomprehensible forms. One thing did stay the same: a blank white mask with dark eyes. Struggling to his feet, he asked what the thing wanted.
"While you were alive, you suffered a mental disease. One side is destined for Heaven, the other for Hell."
He looked to the right and saw the room was a half circle with a wall-sized mirror. He looked his reflection in the eyes.
"One is all that's allowed," the thing stated. "One must overtake the other. The key will only work for one." The thing vanished.
Out of the corner of his eye he saw a door, and a key on the floor.
His reflection moved.
Common sense told him to move. Without thinking, he struck his double and knocked him down. Not pausing to reconsider, he stomped on his throat. The double layed there, wheezing and grabbing at the hard-grainy, black-stone floor.
Satisfied with his work, he picked up the key, and put it to the door, which had no keyhole. The key merged into the door and disappeared to be replaced by a doorhandle. The door was a couple feet taller than him, dark brown, and was obviously made of wood, but it seemed to lack that pourus aspect of natural wood. It was as if it was a plant grown specifically to be a door. A split flash of thought showed him the comical image of doors sprouting out of someones garden. Running one hand along the strange material, he opened it and was struck by a blinding light.
"Heaven," he said, and passed through, the door closing behind him.
The thing appeared again, ready to accept the next one. The double turned black and turned into sand upon the floor, which absorbed it just as fast. With a sigh, the thing stated;
"Just because the fire's bright, they always think it's heaven."