How the heck does fatigue and Communion work?

[Huzurdaddi]

So I was testing out a new theory with communion and I saw something I could not explain.

I had 8 communicants and 4 Theurg Acolytes ( astral 1, holy 2 ) the acolytes were acting as communion masters.

So I had the acolytes scripted for communion master, smite, smite, smite, smite ( btw, not nearly as effective as I was thought it would be ).

The weird thing was that each casting of smite cost each acolyte 4 fatigue. However smite is a 0 fatigue spell. Does anyone know what is going on?

I was sure that this was one way I could use communincants without releif and not lose all of my communicants. However it did not work out the communicants lost fatigue at a break neck rate.