I've noticed that the spells gained between lvls 11 and lvl 19 are perfect for pulling mobs out of groups (singles out of groups)
I just do this for fun, but I don't know if anyone else does it.
just cast Invisibility on yourself, then run into a group of single mobs, then target one, but don't engage, then retreat to a safe diffence. Once you are a safe distance from the pack of mobs, have your pet attack the targeted mob, then as soon as he engages, pull him back. As soon as your pet gets back to you, have it attack the monster again. Then, you can just sit back and heal your pet while he bashes the monster(this is assuming he can do so).
I'm lvl 18 and I can take out lvl 20 heroic wolves in the antonicas with this technique, so I know it works somewhat.