When you call a summon they won't always do the same thing. They are entities that exist in the world itself. So depending on the situation they will do different things. Examples given Titan sometimes will run up and melee hit an enemy, sometimes he will throw boulders at the enemy and its possible he will even give up and leave the battle. They will also act differently in a dungeon than they will in the overworld. Its a huge focus for the staff for Summons to feel exciting and a major event when they show up, not just some random monster that swoops in.
Se me pasó ponerlo en #1.