Irondeath and PG, 
At the time of the game, the PDF we had downloaded from the SG site only mentioned "units" not "Daemonic units", which we read to mean 
anything nearby. Since the GD had barged into the centre of the IG formation, this actually covered most of the IG units and caused what we took to be a skewed effect - which is why we reset it. As TRC said, there is no 'agenda' as such other than to test what seem to my uninitiated eye as being OTT as I have explained on the boards, and which have been listed as items for testing. 
Personally, I must admit I quite like the idea of sucking everything into the void, it has a "Buffy" feel to it; why should weaker mortals remain unharmed while greater powers are affected?? 
