Use Earth Shock to interrupt the Druid's HoT-heavy healing during the Rogue's burst window, then reset positioning with Grounding Totem for incoming CC.
Grounding Totem the first hard CC (Polymorph or a Rogue stun) so the Warrior always gets one clean swing before trinketing.
Two casters can kite the Warrior forever - Frost Shock or Earthbind to shut down the kite and let the Warrior close.
Whoever lands Earth Shock on the enemy Nature's Swiftness/big heal first usually opens the window to close out the fight.