Now, there's nothing in the book to say we can't kill casters, I'm simply telling you (WoW Gold)that it's a helluva lot easier to kill melee mobs than these suckers. And as well as that, you'll find that where you can get about 6-7 melee mobs on you and stay relatively healthy, 6-7 caster mobs are going to hurt you... a lot...
Casters are those painfully annoying mobs who don't actually hit you often, but rather spend 1.5 to 2 seconds casting spells that do far more damage (WoW Gold)than your average melee attack. Basically, they're not hitting you enough to justify your retribution aura, BoS, doing enough damage to kill them, they do way more damage than melee mobs and are therefore way more of a pain in the patooty.
What to do - Caster mobs are still relatively simple enough to handle. Whereas I recommended using Seal of Light, and judgement of light on the melee mobs to keep your health up, you want to take down caster mobs fast.
Take them 1 at a time just like you used to when you were retribution! Run up to them with Seal of (WoW Gold)Righteousness and when they start casting smash them in the face with it. Put it back up and beat on them some more. Judge them with it whenever you can and rinse and repeat throwing in heals if necessary (probably not assuming you have a decent amount of health and there's only one) If they're an elite or you think you might have trouble taking them out, throw down some consecrations as well and use hammer of justice wisely (aka at the end of their spell casting so they've wasted their time)
This is a pure alliance spot to grind in. Horde can't kill these Orcs, we work for them. I added this video purely to show you the effectiveness of prot pally aoe grinding. The paladin did fairly well all in all, although I prefer to keep my health a little higher than she did. Have a look for yourself, this will give you a basic, decent idea of what you're aiming for.