I see you're protect spec'd. You are fighting him sword and board yes? Spam that sucka with Sunders, shield bash, concus blow, intimadate, anything you can to prevent him from casting, and staying in soft caster form.
I've beaten a druid or two just messing around, but I use Outfitter and have my outfits binded, I load up on Sunders, T. Clap, Demo. shout. I then hit my Dual wield button, get a little quick rage. Since you're Protect spec'd you can Concus blow to interrupt casting, then change to shield to continue to interrupt casting, heck if needed stance to Berserk and Pummel him. I change my outfits when I see fit. Shield if I'm in need of interrupting spells, or you can always kick his butt with a shield thanks to specs.
You don't let him get that heal off you're ok. Can always bandage up when he breaks your hammy prolly with traven form, then Intercept him.
Meh, looks good on paper right lol. How does your normal fights go? I'm courious to read about it.