Player preference on kill order. The most important thing you can do when fighting druids is always put your DPS on the target that is most reachable, otherwise you aren't doing anything. Period. If your Warrior attacks their druid, you should go on their druid, but be keep an eye on his health bar. If your Druid gets low...Intervene/Disarm is a life saver. If their Warrior attacks your Warrior, attack the warrior back, but if you have an opportunity to Intercept and Enraged-Mortal Strike the Druid while he's in caster form...do so. If your Warrior gets low, you should also switch to Defensive Stance and Disarm/Thunder Clap/Demo Shout. Your Druid should be alternating Cyclone/Root to keep diminishing returns low. It almost always comes down to who has better gear in this situation.

For the Druids: drink whenever possible even if you only drink for one tick. Use Innervate early, you should gain the mana advantage when your second Innervate is ready. Disturb the opposing Druid only if you have the mana-advantage, otherwise there is no use in keeping both of you in combat. Preemptive HOTs on your Warrior before he pressures the other Warrior is the key to gaining the mana-advantage. HOT him, run away and drink, come back and disturb the other druid. If your warrior is in a position to keep both the Warrior and Druid in combat he should switch to a 1 handed weapon and shield and defensive stance to allow you to drink to full mana. Cyclone the druid during innervate, it won't tick then. Once you have the mana advantage you can either help dps the Warrior when the Druid runs out of healing range or you can help chase the Druid down with Rootspam, Feral Charge/Bash while in casterform or Cyclone. CC the Warrior before your Warrior intercepts the Druid. When you feel you are about to lose the mana advantage repeat the preemptive hotting and drinking.