Maybe my memory is fuzzy but isn't f+C the one where he strikes low then pulls his sword upwards?
If so, yeah, it makes sense it hits low, when I was too far away from flooring an opponent to do like c.B I'd go for that move if I could.
Re: Blood Kain:
I became a believer in the awesomeness of that move a few days ago when I accidentally managed to pull out Blood Kain rather than Carnage Scissors (it was the stick, not me). It turned into blessing in disguise. I for some reason didn't think of it as a Dragon Install move but when I used it, loved the options it opened up for me and the life I got back from it. Totally turned the match around in my favor since I was on the losing side of the match before the accident...that is cool.