To me Fear and Calm seem redundant. Both spells are made to get an enemy off your character. Maybe I am not using them right? (I usually cast Calm when an NPC ignores my follower and summons and comes straight for my mage. I've used Fear before a couple of times but the only difference seems to be that instead of calming down the NPC flees.) What makes these spells different enough that both of them are in the game? How do you use them differently?