E/O Drabble Challenge, word: tilt.  Summary: Tag to 2.14, BUABS.
There are things even a hunter can't fight – and it hurts to be
a helpless witness.  AN: Happy birthday Mainegirlwrites – I hope
you've had a glorious day, unlike Sam, I'm afraid. This might be
a bit darker than what you've wished for, but blame it on my
muse. Hope you enjoy anyway...  He heard Dean's skull hit the
floor with a dull thud, watched bloody knuckles beat the crap
out of his brother, felt the demon cheering all around him with
satisfaction, but he couldn't talk his fists into relaxing,
couldn't fight against the cold and insane darkness inside
anymore, wasn't even sure how to separate his own self from the
alien one and the burning sensation in his side only added to
the searing pain he'd felt the last few days watching, hearing,
witnessing without any control until finally it tilted his head
and vanished... and he could let go consciousness.