If by "kill moves," you mean the cinematic kills that occur every once in a while, then no, there isn't a special command you need to use to trigger them. I am not knowledgeable about the underlying functionality of these cinematic kills, but in my experience if you're killing enemies in just a few hits or even one hit, it's not going to happen as often unless you modify the frequency somehow. Edit: From doing a little browsing, I think I may have misinterpreted your post initially. If by kill moves, you mean different power attacks resulting in kills, they should function the same as armed attacks, i.e. move left and attack for a side attack of some sort.