@jared: Because action is choice of means in order to bring about an outcome. For an omniscient being, there is no choice, there is simply actualization of an already-determined outcome. This is like the difference between playing pinata with or without the blindfold - without the blindfold, there really is no such thing as "trying" to hit it, you just hit it. In our pinata metaphor, action is the selection of the bat, it is the swing, it is the reaction to being bumped by the pinata, and so on. It is the choice of means to attain a given end, not the end itself.
Clayton -
