2. Sacrifice is a bad spell and you should not use it.
I agree its problematic in the way it swaps people around, in some dungeons or against certain enemies i don't use it. There are other situations though that demand it, especially if you don't have a healer or if someone is blocked behind many enemies and low on hp... i could go on. The Trunk's sidekick spell is certainly more efficient, even protoflex's shove-sacrifice i'd say.