Scary. Particularly scary in its implications - I mean, we know that John knew about the Yellow-Eyed Demon and what he did to Sam a long time before Sam and Dean found out. His killing the Demon then may have had less to do with Mary and more to do with Sam.

Which means, really, everything he did was for Sam. It makes sense, given the burden he placed upon Dean as Sam's protecter, from the time he was little.

This is a brilliant little fic - and like all brilliant fics, it made me think about the canon in a different light.

Because what we don't know is exactly how much John really knew.