Armor of Virtue not working?

[JimMorrison]

But it applies the effect at the very start of battle, so if they have to actually cast the spell, they are too late.

Edit: Actually it's been implied that the effect is applied at the END of the first round, which is weird, and the reason you can't move the first round or you don't get it. So yes, it should work even on slaves who cast Communion Slave in first round. ** I could be wrong! **