That looks awesome! I love how all the flickers of magic combined (flames, blue shades, and some sparks). By the way, who did you fight? Was he a named mage or just a really powerful guy?
At the time I was doing thhttp://www.uesp.net/wiki/Skyrim:Ansilvund radiant quest by Oengul War-Anvil where I had to obtain the Queen Freydis's Sword. Since I have my level settings on master the warlocks there was indeed powerful. The mage that I decapitated on the screenshot was throwing Incinerate destruction spells at me. Of course you see him using his weak Flame cloak.
I might figure out how to turn off killcams. I can see them annoying me greatly.
"set killmoverandom 0" in console will effectively disable them - giving them a 0% chance of propagating. 50 is default, and 100 will make them happen every time.