

While it's possible to enter into a finishing move animation on uneven terrain, it's far more likely to happen if both you and the enemy are standing on a flat, level surface.

The terrain: finishing moves appear to depend on relative elevation.It should be noted that your steath state has an affect as well.There are also finishing moves which require your enemy to have surrendered and fallen down to their hands and knees. For example, there is a one-handed sword stab-through-the-middle execution that will only play if you're standing behind a humanoid opponent. Some enemies in the game seem to have no finishing moves associated with them. killing an enemy while sneaking and remaining undetected will allow a Kill Camera, even if there are more enemies present.

But this does not mean that only killing the last active/aggressive enemy will trigger a kill cam, e.g. Due to this, killing the last active/aggressive enemy will often trigger a finishing move / kill cam.
