Time is, without going into the highest ends of physics, not a meaningful construct outside of human perception. This holds especially true for text-based combat as the process by which one would "control time" would largely involve knowledge of every state of every fundamental particle in the universe and rearranging them to suit the given pattern they were in at the time you wish to go back to.

This, obviously, is largely impossible because it requires omnipotence and omniscience.

Altering someone's perception of time, however, achieves the same effect with much less malarkey.

In fact, it's easier to restructure reality in a small area than it is to manipulate time - and when you think about it, that's a bit ridiculous. Personally, I've never enjoyed time manipulation because it is A) An unsatisfying way to win, B) Impossible to validate for most characters, and C) Its results are easy to replicate without going to the effort of actually rearranging the universe.