Possible Duplicate:
What determines when you do a finishing move?
Skyrim updated to 1.5 but no 'cinematic killcam'
In the latest Skyrim update, killcams for bow/arrows and magic was added.
But it does not happen with every kill.
What determines when the killcam happens? It does not seem to be random and I have heard things like it being the last enemy in the area.