WOW Power Leveling: I can't see how you can take damage for that long since you will run out
If you're using this strategy, be prepared for a longish fight. Some folks are reporting 30 minutes or more, though I can't see how you can take damage for WOW Power Leveling that long since invariably you will run out of power.
Power-breaking while kiting (for bardic types especially (power damage), but rest of scouts that have solid bow abilities): Snare and keep the mob snared. Otherwise he will likely outrun you.
Use stifle / interrupt spells and power damage / drain spells (when he stops to cast) to minimize damage to you. Save your best bow abilities for the end of the fight, when they'll do the most damage.
When you attack or aggro this group, a barrier is placed in front of the exit and a ring event begins (i.e. a "ring event" is a series of aggro encounters, a new encounter group spawning every few moments whether or not you've killed the preceding group - it can get hairy fast!). If your mez has a group mez, now is when he / she will shine.
Close in for the melee kill when he's down to 20% (one bubble) health. But not until then... you can't stand toe to toe with the champ at half health and have a good chance of survival.
Finally, if you succeed, speak to Fip and tell him you want to collect your winnings.