Ran into this last night:
If a necromancer's power is triggered so that he summons a re-animate, AND if you have no re-animates left in reserves, can you destroy one in another area and then place it in the battle?
According to the rules, you can do this for recruiting purposes, but it's not clear if this summoning applies as well.
We played that the necro COULD destroy and summon a re-an from elsewhere. That ruling cost me two key fights against my undead opponent, so I'm particularly curious.....