Once the black mage's mind control wears off, the enemy unit that was once a puppet should die. Otherwise this power becomes a nuisance, as your clerics will end up healing a unit back to its max health, for it to attack you fully later on.
I feel like the achievements are trivial. You're rewarding me for looking away for ten seconds. They're infinitely annoying when they keep popping up and I'm trying to kill stuff.
PLEASE FORWARD THIS:
Developer, allow for the game to kick you back out to the lobby after 15 seconds if the other person can't connect to you. Otherwise the player is stuck in a "connecting" screen.
Most players don't like mind control in its current form. I'm thinking what to do with it.