Well on my last one I was just inches from striking the final blow on a bandit chief when all of a sudden my camera went into third person and the bandit wound up and dealt me a final blow. It was literally a wtf moment as there is no way my shot should have stopped just so I could have a good death when I should have gotten the kill.
Because it clearly wasn't what I was doing before hand. I was not standing in the spot it put me in and I could have prevented death if I had control.
People keep telling me this, and yet despite the fact I played a melee-only character through 46 levels, I've never had this happen even once. Certainly not in the middle of what was going to be my killing blow on the other guy. I don't really care so much about the cutscene shifting my position a bit. It's a trifle odd, I'm not sure why it would do that, but I've never seen a kill-cam save my enemy at the last second.
I also never hear anybody complain "Hey, the other guy was gonna hit me and really would have killed me, but I got lucky and triggered a kill-cam and won. The injustice!"
The arrow-kill-cams I won't comment on as I haven't done enough archery to talk about it.