User blog comment:JmLyan/Sairei, the Dimensional Mistress/@comment-5493192-20140424173717/@comment-7481207-20140424180518

Guess the effect got a bit lost in a flavourful description. You activate it, showing your allies that you do so, but not your enemies. After 5 seconds, it reverts time to when you first cast it. Basically, everything that happens in those 5 seconds are ignored. BUT! If you reactivate it before the 5 seconds run out, you get to keep everything that happened.

That ultimate would be so easier to explain by simply stating that it reverses time if it were'nt for the fact that it would get in the way of flavour.