If anything can be divided in half, then omnipotence can be divided by halves.
We have the ability to move ourselves and effect things we can reach in some way (as time is always progressing forward; nothing can be achieved in an instant) therefore we are potent, however we cannot effect things we cannot reach, we cannot move within an instant, for we are not omnipotent.
And it is by the virtue of not being omnipotent that we can die, as if we were omnipotent then it is guaranteed that no being would be able to will themselves past the fear of nonexistence (if we were omnipotent, we would know everything including fear and how bad nonexistence would be).