Spells/Mage question.

[Vilk]

In fact sacrifice cost much more than resurrect in term of mana/number resurrected and I won't mention using Cardinal when you have some in your troops and your troops get bigger. So prefer resurrect and Cardinal if you can before looking at sacrifice. But with charmed units and enough mana then obviously sacrifice is better.

If with sacrifice you get a unit with red bar the fight doesn't end and you'll have to fight the red unit until it come back to normal state. That point is perhaps linked to int level like is a troop that become crazy after a wolf attack.

Yes the key point is to remember what's your current max for each pack.