1. When enemies summon monsters and you kill the enemy the spawn doesn't die. I am looking at you, Spriggan! Some enemies like Necromancer works just fine. When you kill it, the adds die.
I wouldn't be bothered about having to kill the Adds afterward IF they gave exp/loot for killing them.
3. Enemies can chase you far out of their leash ranges attacking you yet when you turn and fire back they heal to full and run away. This needs changed. If an enemy outside of leash range attempts to perform ANY action it should immediately run back without causing further damage to the player.
Within; Without.