The Flash of a demon

I sit on the floor looking at his body
there is blood pooled around him
I don't understand why I did that to him
he has a knife in his chest
tears run down my face
what would cause me to grab a knife and stab you
part of me fells happy and joyful
but the other half is crying and wanting to die
I know what was what made me kill you
my other
myself
my sin
It was I who did it
now my demon alone
but it was I who grabbed the knife
I stabbed you