Ability Unit Models: How'd I keep em there?

Ok, let me give you an example of my problem. I make a unit model, of the Blademaster's mirror image (You know the one, where it shows a shaking green figure) the problem is, how do I keep it looping? On the WE it keeps looping but once I get into the game, it acts as if I just used the ability, so you see the little green shaking figure animation and then Poof, all your left with is a shadow.

So, is there anyway to keep it looping, or will I forever be doomed to a shadow unit?