the shield will drain mana as long as you have it up.
1. cast focus
2. send pet to the enemy. let it get hit
3. then send it to a few more enemy
4. drag back the mob to near you.
5. step into the middle of the mob when they are about half health and cast
PB a few times. PB,PB,quickcast PB iirc.
6. get loads of xp :-)
Have a manna buff or FoP with you and you'll rock.
Have a healer mate to heal the pet (which needs to be on passive for this)
and stun and you can go on for ages.
it's a fast way to level, but alot of people think it's slow in this age of
PLing in MG etc.
They nerfed it pretty bad so it's not really that useful anymore.
Pre pet-pulling nerf it was a very fast way to get xp. Basically buff
pet, have it pull lots of mobs, shield pet, chain heal pet, have your
aoe casters finish off hurt mobs once pet gets good aggro.
Pre focus-shield-aggro nerf and focus-shield-against-deep-purples
nerf, you could basically take down high level mobs by chain healing
the pet while the mob beat itself to death on your focus-shielded pet.